To register for FlatUse, install the App on your mobile device from App Store!App Store Play Store
Register with your local mobile phone number and get per sms an pin-code.
The FlatUse System will sent you an SMS to your registered phone number. With the pin-code you can finish your registration and use the pin for a future login as an password.
If some things are still unclear, here are the most important questions and answers.FAQ & Manuals
Available for free in your app store to download!App Store Play Store