Yes, there is no "proprietary" connection. As soon as an iOS or Android mobile device is equipped with the Teebike app, you can connect it to the electric wheel.
Caution: You cannot connect several devices at the same time to the Teebike electric wheel. The Bluetooth signal only accepts one connection. So the phone that is connected first will drive your wheel.
If you want to connect another phone, you need to disconnect the first phone (close the application or disconnect your bluetooth link) and start the connection of the second phone.