The app is designed specifically for users with very low vision.
It offers intuitive features to simplify call handling:

- Shake your phone to call a predefined number
- Shake your phone to answer an incoming call
- Shake your phone to end an ongoing call

These options can be easily enabled or disabled from the app's main screen.
You have to shake the phone for at least 1/2 second for the enabled functions to work.

Explanation of the permissions requested by this app:
- Telephone permissions: Required to make and answer calls, as well as to detect the phone's state (e.g., call in progress).
- Notification permissions: Used to allow the app to run in the background as a service. This functionality is active only when at least one feature switch is enabled.
- Contacts permission (optional): Allows the user to select the default phone number from their contact list.

This an open source app and its code is available at https://github.com/imprologic/shake-to-call-android/tree/main