HomeGuidesReferenceLearn

Reference version

ArchiveExpo SnackDiscord and ForumsNewsletter

Expo Cellular iconExpo Cellular

GitHub

npm

An API that provides information about the user's cellular service provider.

Android
iOS
Web

expo-cellular provides information about the user's cellular service provider, such as its unique identifier, cellular connection type, and whether it allows VoIP calls on its network.

Installation

Terminal
- npx expo install expo-cellular

If you are installing this in an existing React Native app, start by installing expo in your project. Then, follow the additional instructions as mentioned by the library's README under "Installation in bare React Native projects" section.

Configuration

Are you using this library in a bare React Native app?

Learn how to configure the native projects in the installation instructions in the expo-cellular repository.

API

import * as Cellular from 'expo-cellular';

Constants

Deprecated Use allowsVoipAsync() instead.

Cellular.allowsVoip

Type: boolean | null


Indicates if the carrier allows making VoIP calls on its network. On Android, this checks whether the system supports SIP-based VoIP API. See the Android documentation for more information.

On iOS, if you configure a device for a carrier and then remove the SIM card, this property retains the boolean value indicating the carrier’s policy regarding VoIP. If you then install a new SIM card, its VoIP policy boolean replaces the previous value of this property.

On web, this returns null.

Example

Cellular.allowsVoip; // true or false

Deprecated Use getCarrierNameAsync() instead.

Cellular.carrier

Type: string | null


The name of the user’s home cellular service provider. If the device has dual SIM cards, only the carrier for the currently active SIM card will be returned. On Android, this value is only available when the SIM state is SIM_STATE_READY. Otherwise, this returns null.

On iOS, if you configure a device for a carrier and then remove the SIM card, this property retains the name of the carrier. If you then install a new SIM card, its carrier name replaces the previous value of this property. The value for this property is null if the user never configured a carrier for the device.

On web, this returns null.

Example

Cellular.carrier; // "T-Mobile" or "Verizon"

Deprecated Use getIsoCountryCodeAsync() instead.

Cellular.isoCountryCode

Type: string | null


The ISO country code for the user’s cellular service provider. On iOS, the value is null if any of the following apply:

  • The device is in airplane mode.
  • There is no SIM card in the device.
  • The device is outside of cellular service range.

On web, this returns null.

Example

Cellular.isoCountryCode; // "us" or "au"

Deprecated Use getMobileCountryCodeAsync() instead.

Cellular.mobileCountryCode

Type: string | null


The mobile country code (MCC) for the user’s current registered cellular service provider. On Android, this value is only available when SIM state is SIM_STATE_READY. Otherwise, this returns null. On iOS, the value may be null on hardware prior to iPhone 4S when in airplane mode. Furthermore, the value for this property is null if any of the following apply:

  • There is no SIM card in the device.
  • The device is outside of cellular service range.

On web, this returns null.

Example

Cellular.mobileCountryCode; // "310"

Deprecated Use getMobileNetworkCodeAsync() instead.

Cellular.mobileNetworkCode

Type: string | null


The ISO country code for the user’s cellular service provider. On iOS, the value is null if any of the following apply:

  • The device is in airplane mode.
  • There is no SIM card in the device.
  • The device is outside of cellular service range.

On web, this returns null.

Example

Cellular.mobileNetworkCode; // "260"

Hooks

usePermissions(options)

ParameterType
options
(optional)		PermissionHookOptions<object>

Check or request permissions to access the phone state. This uses both Cellular.requestPermissionsAsync and Cellular.getPermissionsAsync to interact with the permissions.

Returns:

[null | PermissionResponse, RequestPermissionMethod<PermissionResponse>, GetPermissionMethod<PermissionResponse>]

Example

const [status, requestPermission] = Cellular.usePermissions();

Methods

Cellular.allowsVoipAsync()

Returns:

Promise<boolean | null>

Returns if the carrier allows making VoIP calls on its network. On Android, this checks whether the system supports SIP-based VoIP API. See here to view more information.

On iOS, if you configure a device for a carrier and then remove the SIM card, this property retains the boolean value indicating the carrier’s policy regarding VoIP. If you then install a new SIM card, its VoIP policy boolean replaces the previous value of this property.

On web, this returns null.

Example

await Cellular.allowsVoipAsync(); // true or false

Cellular.getCarrierNameAsync()

Returns:

Promise<string | null>

Returns name of the user’s home cellular service provider. If the device has dual SIM cards, only the carrier for the currently active SIM card will be returned.

On Android, this value is only available when the SIM state is SIM_STATE_READY. Otherwise, this returns null.

On iOS, if you configure a device for a carrier and then remove the SIM card, this property retains the name of the carrier. If you then install a new SIM card, its carrier name replaces the previous value of this property. The value for this property is null if the user never configured a carrier for the device.

On web, this returns null.

Example

await Cellular.getCarrierNameAsync(); // "T-Mobile" or "Verizon"

Cellular.getCellularGenerationAsync()

Returns:

Promise<CellularGeneration>

Returns a promise which fulfils with a Cellular.CellularGeneration enum value that represents the current cellular-generation type.

You will need to check if the native permission has been accepted to obtain generation. If the permission is denied getCellularGenerationAsync will resolve to Cellular.Cellular Generation.UNKNOWN.

On web, this method uses navigator.connection.effectiveType to detect the effective type of the connection using a combination of recently observed round-trip time and downlink values. See here to view browser compatibility.

Example

await Cellular.getCellularGenerationAsync();
// CellularGeneration.CELLULAR_4G

Cellular.getIsoCountryCodeAsync()

Returns:

Promise<string | null>

Returns the ISO country code for the user’s cellular service provider.

On iOS, the value is null if any of the following apply:

  • The device is in airplane mode.
  • There is no SIM card in the device.
  • The device is outside of cellular service range.

On web, this returns null.

Example

await Cellular.getIsoCountryCodeAsync(); // "us" or "au"

Cellular.getMobileCountryCodeAsync()

Returns:

Promise<string | null>

Returns mobile country code (MCC) for the user’s current registered cellular service provider.

On Android, this value is only available when SIM state is SIM_STATE_READY. Otherwise, this returns null. On iOS, the value may be null on hardware prior to iPhone 4S when in airplane mode. Furthermore, the value for this property is null if any of the following apply:

  • There is no SIM card in the device.
  • The device is outside of cellular service range.

On web, this returns null.

Example

await Cellular.getMobileCountryCodeAsync(); // "310"

Cellular.getMobileNetworkCodeAsync()

Returns:

Promise<string | null>

Returns the mobile network code (MNC) for the user’s current registered cellular service provider.

On Android, this value is only available when SIM state is SIM_STATE_READY. Otherwise, this returns null. On iOS, the value may be null on hardware prior to iPhone 4S when in airplane mode. Furthermore, the value for this property is null if any of the following apply:

  • There is no SIM card in the device.
  • The device is outside of cellular service range.

On web, this returns null.

Example

await Cellular.getMobileNetworkCodeAsync(); // "310"

Cellular.getPermissionsAsync()

Checks user's permissions for accessing phone state.

Returns:

Promise<PermissionResponse>

Cellular.requestPermissionsAsync()

Asks the user to grant permissions for accessing the phone state.

Returns:

Promise<PermissionResponse>

Enums

CellularGeneration

Describes the current generation of the cellular connection. It is an enum with these possible values:

CellularGeneration Values

UNKNOWN

CellularGeneration.UNKNOWN ＝ 0

Either we are not currently connected to a cellular network or type could not be determined.

CELLULAR_2G

CellularGeneration.CELLULAR_2G ＝ 1

Currently connected to a 2G cellular network. Includes CDMA, EDGE, GPRS, and IDEN type connections.

CELLULAR_3G

CellularGeneration.CELLULAR_3G ＝ 2

Currently connected to a 3G cellular network. Includes EHRPD, EVDO, HSPA, HSUPA, HSDPA, HSPAP, and UTMS type connections.

CELLULAR_4G

CellularGeneration.CELLULAR_4G ＝ 3

Currently connected to a 4G cellular network. Includes LTE type connections.

CELLULAR_5G

CellularGeneration.CELLULAR_5G ＝ 4

Currently connected to a 5G cellular network. Includes NR and NRNSA type connections.

Error codes

CodeDescription
ERR_CELLULAR_GENERATION_UNKNOWN_NETWORK_TYPEUnable to access network type or not connected to a cellular network

Permissions

Android

You must add the following permissions to your app.json inside the expo.android.permissions array.

Android PermissionDescription

READ_PHONE_STATE

Allows read only access to phone state, including the current cellular network information, the status of any ongoing calls, and a list of any PhoneAccounts registered on the device.

Allows read only access to phone state, including the current cellular network information, the status of any ongoing calls, and a list of any PhoneAccounts registered on the device.

iOS

No permissions required.