If you have a T-Mobile MDA or a Cingular 8125 and are planning to switch from one GSM provider to the other, Gizmodo offers a guide to unlocking your phone so you don’t have to buy a new one.

The short version of the instructions are: download the unlocking tool, run it, write down the SIM unlock code, insert the new SIM, and enter the code.  For more, read the full article at Gizmodo.

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