A designated code permanently unlocks a SIM card.
Global System for Mobile Communication, or GSM, is one of two major phone networks in the United States. The other network is CDMA, or Code-Division Multiple Access. GSM technology is widespread in the U.S., but is more prevalent internationally. GSM and CDMA offer some of the same features, but the differences in technology make GSM phones incompatible on CDMA networks. GSM phones use a SIM card, which encrypts personal information allowing a user to jump on a GSM network. Unlocking a SIM card requires an unlock code obtained from the carrier or purchased online. After receiving an unlock code the user can, in some cases, manually unlock the phone. SIM card unlocking methods vary, but there are basic techniques that apply to all GSM-compatible phones.
Instructions
1. Obtain your 15-digit IMEI number by entering #06# using your phone keypad. The IMEI number is also printed on a white sticker attached to the battery carriage. You can find the number under the battery in back of the phone.
2. Obtain an unlock code from the carrier or purchase a code online. AT&T provides an unlock code to current and previous customers if the customer has service for at least 90 days and is current on all payments at the time of the request. T-Mobile usually provides an unlock code, but you may need to obtain it from the phone manufacturer. Depending on the type of phone, you may purchase an unlock code from an online vendor such as Mobile Unlock Solutions, GSM Liberty, or The Travel Insider.
3. Turn off your phone and remove your old SIM card. Insert a SIM card from another carrier. Do not use the SIM card locked to your current carrier.
4. Turn on your phone. Your phone will prompt you to enter the unlock code.
5. Enter the code using your phone keypad. Your phone is now unlocked. You will never have to enter the unlock code into your phone again.
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