> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mobilerun.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Set device language/locale

> Sets the device language/locale to the BCP-47 locale in the request body. An optional restart flag applies the change immediately by restarting the zygote instead of waiting for the next reboot.



## OpenAPI

````yaml /api-reference/phones/tools.yaml post /devices/{deviceId}/language
openapi: 3.1.0
info:
  title: Tools
  version: v1
servers:
  - url: https://api.mobilerun.ai
    description: Droidrun Cloud API
security:
  - bearerAuth: []
paths:
  /devices/{deviceId}/language:
    post:
      tags:
        - Misc
      summary: Set device language/locale
      description: >-
        Sets the device language/locale to the BCP-47 locale in the request
        body. An optional restart flag applies the change immediately by
        restarting the zygote instead of waiting for the next reboot.
      operationId: set-language
      parameters:
        - in: path
          name: deviceId
          required: true
          schema:
            type: string
        - in: header
          name: X-Device-Display-ID
          schema:
            default: 0
            format: int64
            minimum: 0
            type: integer
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SetLanguageArgs'
        required: true
      responses:
        '204':
          description: No Content
        default:
          content:
            application/problem+json:
              schema:
                $ref: '#/components/schemas/ErrorModel'
          description: Error
      security:
        - bearerAuth: []
      x-codeSamples:
        - lang: JavaScript
          source: >-
            import Mobilerun from '@mobilerun/sdk';


            const client = new Mobilerun({
              apiKey: process.env['MOBILERUN_CLOUD_API_KEY'], // This is the default and can be omitted
            });


            await client.devices.language.set('deviceId', { locale:
            'sqf-Kkif-BB' });
        - lang: Python
          source: |-
            import os
            from mobilerun_sdk import Mobilerun

            client = Mobilerun(
                api_key=os.environ.get("MOBILERUN_CLOUD_API_KEY"),  # This is the default and can be omitted
            )
            client.devices.language.set(
                device_id="deviceId",
                locale="sqf-Kkif-BB",
            )
        - lang: Go
          source: "package main\n\nimport (\n\t\"context\"\n\n\t\"github.com/stainless-sdks/droidrun-cloud-go\"\n\t\"github.com/stainless-sdks/droidrun-cloud-go/option\"\n)\n\nfunc main() {\n\tclient := mobileruncloud.NewClient(\n\t\toption.WithAPIKey(\"My API Key\"),\n\t)\n\terr := client.Devices.Language.Set(\n\t\tcontext.TODO(),\n\t\t\"deviceId\",\n\t\tmobileruncloud.DeviceLanguageSetParams{\n\t\t\tLocale: \"sqf-Kkif-BB\",\n\t\t},\n\t)\n\tif err != nil {\n\t\tpanic(err.Error())\n\t}\n}\n"
        - lang: CLI
          source: |-
            mobilerun-cloud devices:language set \
              --api-key 'My API Key' \
              --device-id deviceId \
              --locale sqf-Kkif-BB
components:
  schemas:
    SetLanguageArgs:
      additionalProperties: false
      properties:
        $schema:
          description: A URL to the JSON Schema for this object.
          examples:
            - https://example.com/schemas/SetLanguageArgs.json
          format: uri
          readOnly: true
          type: string
        locale:
          description: >-
            BCP-47 locale: a 2–3 letter language tag, optionally followed by a
            4-letter script and/or a 2-letter region (e.g. en-US, de-DE, ja-JP,
            zh-Hans-CN).
          pattern: ^[a-z]{2,3}(-[A-Z][a-z]{3})?(-[A-Z]{2})?$
          type: string
        restart:
          description: >-
            Restart zygote so the locale change takes full effect immediately.
            Without it, the locale is written but won't fully apply until the
            next reboot.
          type: boolean
      required:
        - locale
      type: object
    ErrorModel:
      additionalProperties: false
      properties:
        $schema:
          description: A URL to the JSON Schema for this object.
          examples:
            - https://example.com/schemas/ErrorModel.json
          format: uri
          readOnly: true
          type: string
        detail:
          description: >-
            A human-readable explanation specific to this occurrence of the
            problem.
          examples:
            - Property foo is required but is missing.
          type: string
        errors:
          description: Optional list of individual error details
          items:
            $ref: '#/components/schemas/ErrorDetail'
          type:
            - array
            - 'null'
        instance:
          description: >-
            A URI reference that identifies the specific occurrence of the
            problem.
          examples:
            - https://example.com/error-log/abc123
          format: uri
          type: string
        status:
          description: HTTP status code
          examples:
            - 400
          format: int64
          type: integer
        title:
          description: >-
            A short, human-readable summary of the problem type. This value
            should not change between occurrences of the error.
          examples:
            - Bad Request
          type: string
        type:
          default: about:blank
          description: A URI reference to human-readable documentation for the error.
          examples:
            - https://example.com/errors/example
          format: uri
          type: string
      type: object
    ErrorDetail:
      additionalProperties: false
      properties:
        location:
          description: >-
            Where the error occurred, e.g. 'body.items[3].tags' or
            'path.thing-id'
          type: string
        message:
          description: Error message text
          type: string
        value:
          description: The value at the given location
      type: object
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: Opaque
      description: Bearer token via Authorization header

````