How to Unlock a Cingular Razr V3
- 1). Find your device IMEI. You will need to give the customer service representative the phone's IMEI number to obtain the unlock code for your phone. The IMEI number is located under the battery on a white sticker. You can also get your phone's IMEI by dialing *#06# on the keypad. The IMEI will display on the screen.
- 2). Call your service provider. Since Cingular is now AT&T, you need to call AT&T. Request an unlock code for your Cingular Motorola RAZR V3 and give the representative the IMEI number.
- 3). Place in your phone the SIM card for the wireless company that you want to use. The SIM card slot is under the battery in the phone. For example, if you plan to use your Cingular phone on the T-Mobile network, place the T-Mobile SIM card in the phone. The phone will request that you enter the unlock code, which is also called a subsidiary code.
- 4). Enter in the unlock code using the phone keypad. The phone will now be unlocked and you can begin using it with the new wireless network.
Source...