@ohos.telephony.observer (Observer)

The observer module provides event subscription management functions. You can register or unregister an observer that listens for the following events: network status change, signal status change, call status change, cellular data connection status, uplink and downlink data flow status of cellular data services, and SIM status change.

NOTE

The initial APIs of this module are supported since API version 6. Newly added APIs will be marked with a superscript to indicate their earliest API version.

Modules to Import

import { observer } from '@kit.TelephonyKit';

NetworkState

type NetworkState = radio.NetworkState

Defines the network status.

System capability: SystemCapability.Telephony.StateRegistry

Type	Description
radio.NetworkState	Network status.

SignalInformation

type SignalInformation = radio.SignalInformation

Defines the signal strength.

System capability: SystemCapability.Telephony.StateRegistry

Type	Description
radio.SignalInformation	Signal strength.

DataConnectState

type DataConnectState = data.DataConnectState

Describes the connection status of a cellular data link.

System capability: SystemCapability.Telephony.StateRegistry

Type	Description
data.DataConnectState	Connection status of a cellular data link.

RatType

type RatType = radio.RadioTechnology

Enumerates the radio access technologies.

System capability: SystemCapability.Telephony.StateRegistry

Type	Description
radio.RadioTechnology	Radio access technology.

DataFlowType

type DataFlowType = data.DataFlowType

Defines the cellular data flow type.

System capability: SystemCapability.Telephony.StateRegistry

Type	Description
data.DataFlowType	Cellular data flow type.

CallState

type CallState = call.CallState

Enumerates call states.

System capability: SystemCapability.Telephony.StateRegistry

Type	Description
call.CallState	Call state.

CardType

type CardType = sim.CardType

Enumerates SIM card types.

System capability: SystemCapability.Telephony.StateRegistry

Type	Description
sim.CardType	SIM card type.

SimState

type SimState = sim.SimState

SIM card state.

System capability: SystemCapability.Telephony.StateRegistry

Type	Description
sim.SimState	SIM card state.

observer.on(‘networkStateChange’)

on(type: \‘networkStateChange\’, callback: Callback<NetworkState>): void

Registers an observer for network status change events. This API uses an asynchronous callback to return the execution result.

Required permission: ohos.permission.GET_NETWORK_INFO

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Network status change event. This field has a fixed value of networkStateChange.
callback	Callback<NetworkState>	Yes	Callback used to return the result. For details, see NetworkState.

Error codes

For details about the error codes, see Universal Error Codes and Telephony Error Codes.

ID	Error Message
201	Permission denied.
401	Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types.
8300001	Invalid parameter value.
8300002	Service connection failed.
8300003	System internal error.
8300999	Unknown error.

Example

observer.on('networkStateChange', (data: observer.NetworkState) => {
    console.log("on networkStateChange, data:" + JSON.stringify(data));
});

observer.on(‘networkStateChange’)

on(type: \‘networkStateChange\’, options: ObserverOptions, callback: Callback<NetworkState>): void

Registers an observer for network status change events of the SIM card in the specified slot. This API uses an asynchronous callback to return the execution result.

Required permission: ohos.permission.GET_NETWORK_INFO

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Network status change event. This field has a fixed value of networkStateChange.
options	ObserverOptions	Yes	Event subscription parameters.
callback	Callback<NetworkState>	Yes	Callback used to return the result. For details, see NetworkState.

Error codes

For details about the error codes, see Universal Error Codes and Telephony Error Codes.

ID	Error Message
201	Permission denied.
401	Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types.
8300001	Invalid parameter value.
8300002	Service connection failed.
8300003	System internal error.
8300999	Unknown error.

Example

let options: observer.ObserverOptions = {
    slotId: 0
}
observer.on('networkStateChange', options, (data: observer.NetworkState) => {
    console.log("on networkStateChange, data:" + JSON.stringify(data));
});

observer.off(‘networkStateChange’)

off(type: \‘networkStateChange\’, callback?: Callback<NetworkState>): void

Unregisters the observer for network status change events. This API uses an asynchronous callback to return the execution result.

NOTE

You can pass the callback of the on function if you want to cancel listening for a certain type of event. If you do not pass the callback, you will cancel listening for all events.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Network status change event. This field has a fixed value of networkStateChange.
callback	Callback<NetworkState>	No	Callback used to return the result. For details, see NetworkState.

Error codes

For details about the error codes, see Universal Error Codes and Telephony Error Codes.

ID	Error Message
401	Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types.
8300001	Invalid parameter value.
8300002	Service connection failed.
8300003	System internal error.
8300999	Unknown error.

Example

let callback: (data: observer.NetworkState) => void = (data: observer.NetworkState) => {
    console.log("on networkStateChange, data:" + JSON.stringify(data));
}
observer.on('networkStateChange', callback);
// You can pass the callback of the on method to cancel listening for a certain type of callback. If you do not pass the callback, you will cancel listening for all callbacks.
observer.off('networkStateChange', callback);
observer.off('networkStateChange');

observer.on(‘signalInfoChange’)

on(type: \‘signalInfoChange\’, callback: Callback<Array<SignalInformation>>): void

Registers an observer for signal status change events. This API uses an asynchronous callback to return the execution result.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Signal status change event. This field has a fixed value of signalInfoChange.
callback	Callback<Array<SignalInformation>>	Yes	Callback used to return the result. For details, see SignalInformation.

Error codes

For details about the error codes, see Universal Error Codes and Telephony Error Codes.

ID	Error Message
401	Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types.
8300001	Invalid parameter value.
8300002	Service connection failed.
8300003	System internal error.
8300999	Unknown error.

Example

import { radio } from '@kit.TelephonyKit';

observer.on('signalInfoChange', (data: Array<radio.SignalInformation>) => {
    console.log("on signalInfoChange, data:" + JSON.stringify(data));
});

observer.on(‘signalInfoChange’)

on(type: \‘signalInfoChange\’, options: ObserverOptions, callback: Callback<Array<SignalInformation>>): void

Registers an observer for signal status change events of the SIM card in the specified slot. This API uses an asynchronous callback to return the execution result.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Signal status change event. This field has a fixed value of signalInfoChange.
options	ObserverOptions	Yes	Event subscription parameters.
callback	Callback<Array<SignalInformation>>	Yes	Callback used to return the result. For details, see SignalInformation.

Error codes

For details about the error codes, see Universal Error Codes and Telephony Error Codes.

ID	Error Message
401	Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types.
8300001	Invalid parameter value.
8300002	Service connection failed.
8300003	System internal error.
8300999	Unknown error.

Example

import { radio } from '@kit.TelephonyKit';

let options: observer.ObserverOptions = {
    slotId: 0
}
observer.on('signalInfoChange', options, (data: Array<radio.SignalInformation>) => {
    console.log("on signalInfoChange, data:" + JSON.stringify(data));
});

observer.off(‘signalInfoChange’)

off(type: \‘signalInfoChange\’, callback?: Callback<Array<SignalInformation>>): void

Unregisters the observer for signal status change events. This API uses an asynchronous callback to return the execution result.

NOTE

You can pass the callback of the on function if you want to cancel listening for a certain type of event. If you do not pass the callback, you will cancel listening for all events.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Signal status change event. This field has a fixed value of signalInfoChange.
callback	Callback<Array<SignalInformation>>	No	Callback used to return the result. For details, see SignalInformation.

Error codes

For details about the error codes, see Universal Error Codes and Telephony Error Codes.

ID	Error Message
401	Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types.
8300001	Invalid parameter value.
8300002	Service connection failed.
8300003	System internal error.
8300999	Unknown error.

Example

import { radio } from '@kit.TelephonyKit';

let callback: (data: Array<radio.SignalInformation>) => void = (data: Array<radio.SignalInformation>) => {
    console.log("on signalInfoChange, data:" + JSON.stringify(data));
}
observer.on('signalInfoChange', callback);
// You can pass the callback of the on method to cancel listening for a certain type of callback. If you do not pass the callback, you will cancel listening for all callbacks.
observer.off('signalInfoChange', callback);
observer.off('signalInfoChange');

observer.on(‘callStateChange’)

on(type: ‘callStateChange’, callback: Callback<CallStateInfo>): void

Registers an observer for call status change events. This API uses an asynchronous callback to return the execution result.

NOTE

Before using this API, you must declare the ohos.permission.READ_CALL_LOG permission (a system permission).

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Call status change event. This field has a fixed value of callStateChange.
callback	Callback<CallStateInfo>	Yes	Callback used to return the result. For details, see CallState. number: phone number.

Error codes

For details about the error codes, see Universal Error Codes and Telephony Error Codes.

ID	Error Message
401	Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types.
8300001	Invalid parameter value.
8300002	Service connection failed.
8300003	System internal error.
8300999	Unknown error.

Example

observer.on('callStateChange', (data: observer.CallStateInfo) => {
    console.log("on callStateChange, data:" + JSON.stringify(data));
});

observer.on(‘callStateChange’)

on(type: ‘callStateChange’, options: ObserverOptions, callback: Callback<CallStateInfo>): void

Registers an observer for call status change events. This API uses an asynchronous callback to return the execution result.

NOTE

Before using this API, you must declare the ohos.permission.READ_CALL_LOG permission (a system permission).

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Call status change event. This field has a fixed value of callStateChange.
options	ObserverOptions	Yes	Event subscription parameters.
callback	Callback<CallStateInfo>	Yes	Callback used to return the result. For details, see CallState. number: phone number.

Error codes

For details about the error codes, see Universal Error Codes and Telephony Error Codes.

ID	Error Message
401	Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types.
8300001	Invalid parameter value.
8300002	Service connection failed.
8300003	System internal error.
8300999	Unknown error.

Example

let options: observer.ObserverOptions = {
    slotId: 0
}
observer.on('callStateChange', options, (data: observer.CallStateInfo) => {
    console.log("on callStateChange, data:" + JSON.stringify(data));
});

observer.off(‘callStateChange’)

off(type: ‘callStateChange’, callback?: Callback<CallStateInfo>): void

Unregisters the observer for call status change events. This API uses an asynchronous callback to return the execution result.

NOTE

You can pass the callback of the on function if you want to cancel listening for a certain type of event. If you do not pass the callback, you will cancel listening for all events.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Call status change event. This field has a fixed value of callStateChange.
callback	Callback<CallStateInfo>	No	Callback used to return the result. For details, see CallState. number: phone number.

Error codes

For details about the error codes, see Universal Error Codes and Telephony Error Codes.

ID	Error Message
401	Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types.
8300001	Invalid parameter value.
8300002	Service connection failed.
8300003	System internal error.
8300999	Unknown error.

Example

let callback: (data: observer.CallStateInfo) => void = (data: observer.CallStateInfo) => {
    console.log("on callStateChange, data:" + JSON.stringify(data));
}
observer.on('callStateChange', callback);
// You can pass the callback of the on method to cancel listening for a certain type of callback. If you do not pass the callback, you will cancel listening for all callbacks.
observer.off('callStateChange', callback);
observer.off('callStateChange');

observer.on(‘cellularDataConnectionStateChange’)⁷⁺

on(type: ‘cellularDataConnectionStateChange’, callback: Callback<DataConnectionStateInfo>): void

Registers an observer for connection status change events of the cellular data link. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Cellular data connection status event. This field has a fixed value of cellularDataConnectionStateChange.
callback	Callback<DataConnectionStateInfo>	Yes	Callback used to return the result. For details, see DataConnectState and RadioTechnology.

Error codes

For details about the error codes, see Universal Error Codes and Telephony Error Codes.

ID	Error Message
401	Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types.
8300001	Invalid parameter value.
8300002	Service connection failed.
8300003	System internal error.
8300999	Unknown error.

Example

observer.on('cellularDataConnectionStateChange', (data: observer.DataConnectionStateInfo) => {
    console.log("on cellularDataConnectionStateChange, data:" + JSON.stringify(data));
});

observer.on(‘cellularDataConnectionStateChange’)⁷⁺

on(type: ‘cellularDataConnectionStateChange’, options: ObserverOptions, callback: Callback<DataConnectionStateInfo>): void

Registers an observer for connection status change events of the cellular data link over the SIM card in the specified slot. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Cellular data connection status event. This field has a fixed value of cellularDataConnectionStateChange.
options	ObserverOptions	Yes	Event subscription parameters.
callback	Callback<DataConnectionStateInfo>	Yes	Callback used to return the result. For details, see DataConnectState and RadioTechnology.

Error codes

For details about the error codes, see Universal Error Codes and Telephony Error Codes.

ID	Error Message
401	Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types.
8300001	Invalid parameter value.
8300002	Service connection failed.
8300003	System internal error.
8300999	Unknown error.

Example

let options: observer.ObserverOptions = {
    slotId: 0
}
observer.on('cellularDataConnectionStateChange', options, (data: observer.DataConnectionStateInfo) => {
    console.log("on cellularDataConnectionStateChange, data:" + JSON.stringify(data));
});

observer.off(‘cellularDataConnectionStateChange’)⁷⁺

off(type: ‘cellularDataConnectionStateChange’, callback?: Callback<DataConnectionStateInfo>): void

Unregisters the observer for connection status change events of the cellular data link. This API uses an asynchronous callback to return the result.

NOTE

You can pass the callback of the on function if you want to cancel listening for a certain type of event. If you do not pass the callback, you will cancel listening for all events.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Cellular data connection status event. This field has a fixed value of cellularDataConnectionStateChange.
callback	Callback<DataConnectionStateInfo>	No	Callback used to return the result. For details, see DataConnectState and RadioTechnology.

Error codes

For details about the error codes, see Universal Error Codes and Telephony Error Codes.

ID	Error Message
401	Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types.
8300001	Invalid parameter value.
8300002	Service connection failed.
8300003	System internal error.
8300999	Unknown error.

Example

let callback: (data: observer.DataConnectionStateInfo) => void = (data: observer.DataConnectionStateInfo) => {
    console.log("on cellularDataConnectionStateChange, data:" + JSON.stringify(data));
}
observer.on('cellularDataConnectionStateChange', callback);
// You can pass the callback of the on method to cancel listening for a certain type of callback. If you do not pass the callback, you will cancel listening for all callbacks.
observer.off('cellularDataConnectionStateChange', callback);
observer.off('cellularDataConnectionStateChange');

observer.on(‘cellularDataFlowChange’)⁷⁺

on(type: ‘cellularDataFlowChange’, callback: Callback<DataFlowType>): void

Registers an observer for the uplink and downlink data flow status change events of the cellular data service. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Cellular data flow change event. This field has a fixed value of cellularDataFlowChange.
callback	Callback<DataFlowType>	Yes	Callback used to return the result. For details, see DataFlowType.

Error codes

For details about the error codes, see Universal Error Codes and Telephony Error Codes.

ID	Error Message
401	Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types.
8300001	Invalid parameter value.
8300002	Service connection failed.
8300003	System internal error.
8300999	Unknown error.

Example

import { data } from '@kit.TelephonyKit';

observer.on('cellularDataFlowChange', (data: data.DataFlowType) => {
    console.log("on cellularDataFlowChange, data:" + JSON.stringify(data));
});

observer.on(‘cellularDataFlowChange’)⁷⁺

on(type: ‘cellularDataFlowChange’, options: ObserverOptions, callback: Callback<DataFlowType>): void

Registers an observer for the uplink and downlink data flow status change events of the cellular data service on the SIM card in the specified slot. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Cellular data flow change event. This field has a fixed value of cellularDataFlowChange.
options	ObserverOptions	Yes	Event subscription parameters.
callback	Callback<DataFlowType>	Yes	Callback used to return the result. For details, see DataFlowType.

Error codes

For details about the error codes, see Universal Error Codes and Telephony Error Codes.

ID	Error Message
401	Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types.
8300001	Invalid parameter value.
8300002	Service connection failed.
8300003	System internal error.
8300999	Unknown error.

Example

import { data } from '@kit.TelephonyKit';

let options: observer.ObserverOptions = {
    slotId: 0
}
observer.on('cellularDataFlowChange', options, (data: data.DataFlowType) => {
    console.log("on cellularDataFlowChange, data:" + JSON.stringify(data));
});

observer.off(‘cellularDataFlowChange’)⁷⁺

off(type: ‘cellularDataFlowChange’, callback?: Callback<DataFlowType>): void

Unregisters the observer for the uplink and downlink data flow status change events of the cellular data service. This API uses an asynchronous callback to return the result.

NOTE

You can pass the callback of the on function if you want to cancel listening for a certain type of event. If you do not pass the callback, you will cancel listening for all events.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Cellular data flow change event. This field has a fixed value of cellularDataFlowChange.
callback	Callback<DataFlowType>	No	Callback used to return the result. For details, see DataFlowType.

Error codes

For details about the error codes, see Universal Error Codes and Telephony Error Codes.

ID	Error Message
401	Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types.
8300001	Invalid parameter value.
8300002	Service connection failed.
8300003	System internal error.
8300999	Unknown error.

Example

import { data } from '@kit.TelephonyKit';

let callback: (data: data.DataFlowType) => void = (data: data.DataFlowType) => {
    console.log("on cellularDataFlowChange, data:" + JSON.stringify(data));
}
observer.on('cellularDataFlowChange', callback);
// You can pass the callback of the on method to cancel listening for a certain type of callback. If you do not pass the callback, you will cancel listening for all callbacks.
observer.off('cellularDataFlowChange', callback);
observer.off('cellularDataFlowChange');

observer.on(‘simStateChange’)⁷⁺

on(type: ‘simStateChange’, callback: Callback<SimStateData>): void

Registers an observer for SIM card status change events. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	SIM status change event. This field has a fixed value of simStateChange.
callback	Callback<SimStateData>	Yes	Callback used to return the result.

Error codes

For details about the error codes, see Universal Error Codes and Telephony Error Codes.

ID	Error Message
401	Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types.
8300001	Invalid parameter value.
8300002	Service connection failed.
8300003	System internal error.
8300999	Unknown error.

Example

observer.on('simStateChange', (data: observer.SimStateData) => {
    console.log("on simStateChange, data:" + JSON.stringify(data));
});

observer.on(‘simStateChange’)⁷⁺

on(type: ‘simStateChange’, options: ObserverOptions, callback: Callback<SimStateData>): void

Registers an observer for status change events of the SIM card in the specified slot. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	SIM status change event. This field has a fixed value of simStateChange.
options	ObserverOptions	Yes	Event subscription parameters.
callback	Callback<SimStateData>	Yes	Callback used to return the result.

Error codes

For details about the error codes, see Universal Error Codes and Telephony Error Codes.

ID	Error Message
401	Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types.
8300001	Invalid parameter value.
8300002	Service connection failed.
8300003	System internal error.
8300999	Unknown error.

Example

let options: observer.ObserverOptions = {
    slotId: 0
}
observer.on('simStateChange', options, (data: observer.SimStateData) => {
    console.log("on simStateChange, data:" + JSON.stringify(data));
});

observer.off(‘simStateChange’)⁷⁺

off(type: ‘simStateChange’, callback?: Callback<SimStateData>): void

Unregisters the observer for SIM card status change events. This API uses an asynchronous callback to return the result.

NOTE

You can pass the callback of the on function if you want to cancel listening for a certain type of event. If you do not pass the callback, you will cancel listening for all events.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	SIM status change event. This field has a fixed value of simStateChange.
callback	Callback<SimStateData>	No	Callback used to return the result.

Error codes

For details about the error codes, see Universal Error Codes and Telephony Error Codes.

ID	Error Message
401	Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types.
8300001	Invalid parameter value.
8300002	Service connection failed.
8300003	System internal error.
8300999	Unknown error.

Example

let callback: (data: observer.SimStateData) => void = (data: observer.SimStateData) => {
    console.log("on simStateChange, data:" + JSON.stringify(data));
}
observer.on('simStateChange', callback);
// You can pass the callback of the on method to cancel listening for a certain type of callback. If you do not pass the callback, you will cancel listening for all callbacks.
observer.off('simStateChange', callback);
observer.off('simStateChange');

observer.on(‘iccAccountInfoChange’)¹⁰⁺

on(type: ‘iccAccountInfoChange’, callback: Callback<void>): void

Registers an observer for account information change events of the SIM card. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Account information change event. This field has a fixed value of iccAccountInfoChange.
callback	Callback<void>	Yes	Callback used to return the result.

Error codes

For details about the error codes, see Universal Error Codes and Telephony Error Codes.

ID	Error Message
401	Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types.
8300001	Invalid parameter value.
8300002	Service connection failed.
8300003	System internal error.
8300999	Unknown error.

Example

observer.on('iccAccountInfoChange', () => {
    console.log("on iccAccountInfoChange success");
});

observer.off(‘iccAccountInfoChange’)¹⁰⁺

off(type: ‘iccAccountInfoChange’, callback?: Callback<void>): void

Unregisters the observer for account information change events of the SIM card. This API uses an asynchronous callback to return the result.

NOTE

You can pass the callback of the on function if you want to cancel listening for a certain type of event. If you do not pass the callback, you will cancel listening for all events.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Account information change event. This field has a fixed value of iccAccountInfoChange.
callback	Callback<void>	No	Callback used to return the result.

Error codes

For details about the error codes, see Universal Error Codes and Telephony Error Codes.

ID	Error Message
401	Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types.
8300001	Invalid parameter value.
8300002	Service connection failed.
8300003	System internal error.
8300999	Unknown error.

Example

let callback: () => void = () => {
    console.log("on iccAccountInfoChange success");
}
observer.on('iccAccountInfoChange', callback);
// You can pass the callback of the on method to cancel listening for a certain type of callback. If you do not pass the callback, you will cancel listening for all callbacks.
observer.off('iccAccountInfoChange', callback);
observer.off('iccAccountInfoChange');

LockReason⁸⁺

Enumerates SIM card lock types.

System capability: SystemCapability.Telephony.StateRegistry

Name	Value	Description
SIM_NONE	0	No lock.
SIM_PIN	1	PIN lock.
SIM_PUK	2	PUK lock.
SIM_PN_PIN	3	Network PIN lock.
SIM_PN_PUK	4	Network PUK lock.
SIM_PU_PIN	5	Subnet PIN lock.
SIM_PU_PUK	6	Subnet PUK lock.
SIM_PP_PIN	7	Service provider PIN lock.
SIM_PP_PUK	8	Service provider PUK lock.
SIM_PC_PIN	9	Organization PIN lock.
SIM_PC_PUK	10	Organization PUK lock.
SIM_SIM_PIN	11	SIM PIN lock.
SIM_SIM_PUK	12	SIM PUK lock.

SimStateData⁷⁺

Enumerates SIM card types and states.

System capability: SystemCapability.Telephony.StateRegistry

Name	Type	Mandatory	Description
type	CardType	Yes	SIM card type.
state	SimState	Yes	SIM card state.
reason8+	LockReason	Yes	SIM card lock type.

CallStateInfo¹¹⁺

Defines information about the call status.

System capability: SystemCapability.Telephony.StateRegistry

Name	Type	Mandatory	Description
state	CallState	Yes	Call type.
number	string	Yes	Phone number.

DataConnectionStateInfo¹¹⁺

Defines information about the data connection status.

System capability: SystemCapability.Telephony.StateRegistry

Name	Type	Mandatory	Description
state	DataConnectState	Yes	Data connection status.
network	RatType	Yes	Network type.

ObserverOptions¹¹⁺

Defines event subscription parameters.

System capability: SystemCapability.Telephony.StateRegistry

Name	Type	Mandatory	Description
slotId	number	Yes	Card slot ID. - 0: card slot 1. - 1: card slot 2.

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