Two years ago I set up an android tablet for my grandmother to make and receive WhatsApp calls. Was a fun challenge to have the setup compensate for her never having used a touch screen before.

One interaction that missed the cut was using the tablet's accelerometer to answer calls so she wouldn't have to interact with the screen at all. Simply tilting the tablet forward and back on it's stand would have answered the call. You just can't beat the customizability of Android (with Tasker) for things like this.

https://kavi.sblmnl.co.za/grandmother-communicator/ https://kavi.sblmnl.co.za/grandmother-communicator-part-2/