app_call

This tool on every surface: CLI · MCP · Python · JavaScript · Go · Java · .NET

Simulate an incoming call: "ring", then "accept" or "hang". Interruption is where mobile apps fail and desktop software does not — a call mid-form, state lost on resume, a callback that never fires — and none of it can be provoked by tapping. Emulator only: a real phone cannot be made to ring from outside, which is a property of phones, and mobium says so rather than failing obscurely. Confirmed against the device's telephony state, not the console's acknowledgement. Discards the refs from the last app_map, since a call takes over the screen.

Changes the device, the app or the session: readOnlyHint is false.

Arguments

Name	Type	Required	What it is
action	string: ring, accept, hang		"ring" (default), "accept" or "hang".
device	string		Device serial to target, e.g. "emulator-5554". Omit when only one device is running.
driver	string: uiautomator2, uiautomator, wda		Driver to use: "uiautomator2" (default for Android; fast, installs a server APK on first use), "uiautomator" (Android, installs nothing, slower, cannot type), or "wda" (WebDriverAgent: iOS simulators and iPhones).
number	string		Calling number. Defaults to 5551234.

Examples

Each is the arguments of a tools/call request; the first is shown whole.

Ring the device with an incoming call

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "app_call",
    "arguments": {
      "number": "5551234"
    }
  }
}

On an Android 15 emulator the answer's text was:

ringing a call from 5551234

mobium call --number 5551234 on an Android 15 emulator

Hang up

{
  "action": "hang"
}

On an Android 15 emulator the answer's text was:

ended a call from 5551234