- 1). Contact T-Mobile customer service at 800-866-2453. Request the unlock code for your Samsung T109. T-Mobile will typically provide the unlock code without a charge. You can also purchase the unlock code from a third-party reseller (see Resources).
- 2). Remove the back cover and battery from the Samsung T109 phone. Slide the subscriber identity module (SIM) card out of the phone. Insert the non T-Mobile SIM card. Replace the Samsung T109's battery and back cover.
- 3). Power on the phone.
- 4). Enter the unlock code using the phone's keypad. Your phone is now unlocked and will work with the non-T-Mobile SIM card.
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