CharlottenB

"Exclusively for everyone who owns an apartment in the Charlottenbogen in Berlin: Nice that you are here! With this app you never have to worry about forgetting your key, because this is your key! For all doors in the Charlottenbogen. Come in!
1. Download the app.
2. Log in with your personal login details/PIN.
3. The app detects nearby doors and shows you which ones you can open with them: If it flashes green, you can enter.

Some features of the app require Bluetooth and location services. Do you have both services activated on your phone? Well then, welcome home!"