Do a simple test; plug out your sim card without Wazapp running and it won't work but if its already running and you take out your sim card it'll work...

On my N9 i registered with a number which SIM card has never been inserted in my N9; got the 3-digit code on another phone entered it manually and it works all fine...Till date another number's SIM is inserted in my N9 and it works ok...