Then is is even more weird for me. I tried all situations. Registered on Android, on ios. Even drop the registration on both? But in no way I can register with sms/call me inside Whatsup.

Maybe someone over here can tell me if it is an problem if you are registered on the ios/android client and then want to try it in Sailfish?

Maybe using a backup (with no history) of an other user is usefull? So it looks like I used Whatsup before, and then try to register my phonenumber?

I hope someone can give me an answer.