It would be nice to have multi-device support.
Response from developer
For your own security, a phone number authorized in the app can only be active on one device. If you attempt to link the same number on another device, the first number will be disabled because only one active session is allowed at the same time. However, you have the option to call our call center (032 2 42 42 45) to add a secondary number to your account and authorize with this new number on a new device.