Sim card question

Can an AT&T Sim card from my 6200IM be used in a Nokia 6102 from Cingular?
Is this what they call unlocking the phone?

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Yes, that is what unlocking a phone will let you do, put your AT&T sim card in a Cingular phone.

Originally Posted by cseabourn

Yes, that is what unlocking a phone will let you do, put your AT&T sim card in a Cingular phone.

Ok. Thank you. I have spent some time looking over the sight. I assume what you're saying is that I must unlock the phone to use the ATT sim card. What is the best source for me to learn to do this?
What if I want to switch back to the cingular sim card and migrate to Cingular? Will that be a problem?

Originally Posted by jaymike

Ok. Thank you. I have spent some time looking over the sight. I assume what you're saying is that I must unlock the phone to use the ATT sim card. What is the best source for me to learn to do this?
What if I want to switch back to the cingular sim card and migrate to Cingular? Will that be a problem?

I don't know exactly how to unlock it, but most likely you can find it out by searching the forums. If and when you switch over to Orange, you phone will work with either sim cards not just one.