The phone number is linked to our SMS service. After requesting an SMS code in the app, you have a limited time of five minutes to log in with the SMS code. The phone number from Londen, UK calls you if you did not receive the SMS code or if you were too late with filling in your SMS code. You can answer this number, the code will be read out loud, whereafter you can log in the app.
We recommend you to set up a passcode in the app.