Mobile confirmation after charging
The app is a scam. After you create an account and pay for your hire (daily, monthly, etc) the app THEN requires a mobile verification that doesn’t work with a foreign number (i.e. if you’re using data roaming). So the subscription you already paid for is unusable. Do better TFL! If you’re visiting London forget the app and just use your credit card at the bike terminal, save yourself the strife.