The Sony Ericsson Z310A is a quad-band Global Systems for Mobile Communications (GSM) cellphone that was originally released in December 2006 and sold by T-Mobile for use on the T-Mobile cellular network. T-Mobile sold the Sony Ericsson Z310A with a Subscriber Identity Module (SIM) lock that prevents using the phone with another GSM cellular service provider's SIM card. You can, however, unlock the SIM card on your Sony Ericsson Z310A so that you can use the phone with a non-T-Mobile SIM card.
Instructions
1. Call T-Mobile customer service at (800) 866-2453. Request the SIM unlock code for your Sony Ericsson Z310A. It is T-Mobile policy to give you the SIM unlock code free of charge if you have an active account that is in good standing. It is also possible to purchase the unlock code from a company that sells unlock codes (see Resources).
2. Remove your T-Mobile SIM card from your Sony Ericsson Z310A. The SIM card is located under the battery compartment, which you can access by removing the phone's back cover and battery. After removing the SIM card, reinsert the battery and place the back cover on the phone.
3. Power on your Sony Ericsson Z310A.
4. Press the left arrow key on your Sony Ericsson Z310A.
5. Press the "*" key on your phone.
6. Press the "*" key on your phone a second time.
7. Press the left arrow key on your phone.
8. Enter the T-Mobile SIM unlock code for your Sony Ericsson Z310A. Your phone is now unlocked.
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