Why could I know how whatsapp detect us?
I'm trying to keep everything updated to official s40 client, and it seems it working fine. I'm using 4 accounts (of course not all by me) and 3 of them has more than 2 years.

Maybe people migrating from android client forgot to close that client before start whatsup for first time, maybe they talk to contacts not in phonebook before sync, maybe they noticed wrong in code and I'm missing it...