You can find it in your app store by searching for BT One Phone.
And it can be installed from the following locations:
To install the BT One Phone mobile app, you'll need:
- Android 4.1 or higher; or
- Apple iOS 7 or higher; or
- Windows 8.1 or higher.
To log in to the app, just use the same username and password as you use to log in to the BT One Phone portal.
If you can't remember your details then tap what are my login details? at the bottom of the screen.