lol, this is getting too complicated.
I'm sure you are quite capable of pulling the SIM card out etc.
That's what I did, with my old tmobile phone sim, and I've had no trouble with the
n95 on the tmobile network - except that some commands don't work, and there is an unresolved SMS issue.
But a few years back, I had a P800 and I was having trouble, it wouldn't work on the sim card from whichever provider (I think it was cingular?). So I went into the store and they were very happy to check through it... ended up programming a whole new sim card for me.
It wasn't that I thought you needed it; I was only giving some generic advice, that if you had trouble, the store guys would help.
Not sure why this has become such a complicated issue :)