SIM cards

I was thinking of upgrading from my Moto phone to a new, PDA style
phone, possibly G1, and am wondering if I could use the same SIM card in
the new one without losing any of the functionality in the new phone
that would come with a new SIM card. I know I can store phone numbers in
a SIM card but I don't know what else might be stored in it by T-Mo that
could be specific to some functionality of the phone that it comes with.
Can somebody answer this?
Thanks,
p j

In article <gj6tci$uej$1@news.motzarella.org>, P J <pj.DeleteThis@pjama.invalid>
wrote:

> I was thinking of upgrading from my Moto phone to a new, PDA style
> phone, possibly G1, and am wondering if I could use the same SIM card in
> the new one without losing any of the functionality in the new phone
> that would come with a new SIM card. I know I can store phone numbers in
> a SIM card but I don't know what else might be stored in it by T-Mo that
> could be specific to some functionality of the phone that it comes with.
> Can somebody answer this?

I don't know. But when I moved from a D&G RAZR to the G1, I just put
the old SIM card in the new phone...no problems.