Changing owners/SIM cards

You do not need to unlock the phone in order to use another sim card with the phone. Just insert the card and as long as the card has been setup with your number, it will work fine. If the card asks for a pin code, you need to contact AT&T or T-Mobile for that code, otherwise you should be good to go. Let me know if you have any problems, or is I did not understand your needs properly, and I will walk you through the process.

changing sim card.............flip phone over....take back off...........take battery out.....take sim out replace it...put battery in..............cover back on done deal....

http://www.unlockitnow.com/Motorola/RAZR%20V3i.php

see this link

Make sure you store all your phonebook contacts in the SIM card and your SMS messages too.
Then exchange the SIM's and your actual line and number will be on the new phone.

There is no sim card, but the memory card is the same thing...

We have the exact same problem and our SIM card starts with 8931. Do you think it will work for us??

Alternatively, you can take the SIM card to any Cingular/AT&T store and get a new one, usually for free.

Otherwise, simply search for the year that SIM card was made in Google using the model number located on it. Then look for phones manufactured around the same time.

The way yo can tell if it's unlocked it's by installing two different types of SIM cards, let's say one from Cingular/ATT and then one for T-Mobile, if they both work...then it's unlocked. They might have not unlocked it properly. Let me know I can try to help

Nextel Phones do not work on cingular

It sounds like your phone is not unlocked. Did you get the phone through a different provider and your sim card through some one else? For ex, here in US, a cingular SIM will not work in a Sprint phone.