I got another what-if situation :-D

If I buy another new phone (not N900 but Lumia) but I use back the sim card from N900 registered with Yappari, when I register whatsapp with the new phone, will they detect I already registered and bar me from register again?

As for the old N900, I might be using a new sim card which I believe delete the config file will let me register yappari as new, am I right?

Thanks in advance :-)

p.s. wow, I just discovered I am the #3000 entry on page 300 :-D