The T Mobile G1 mobile phone can be unlocked for use with another carrier. To use a T Mobile G1 phone on another network with a non-T Mobile SIM card, you must request a SIM Unlock code from T Mobile; to use it with a T Mobile SIM card on another carrier's network, you must request the SIM unlock code from that carrier.
The open source nature of the G1, which uses the Google Android mobile operating system, leaves the door open for developers to provide an unlocking application.Gizmodo: Unlocking the T Mobile G1... (September 24, 2008)
References
Fast Facts
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T Mobile will provide unlock codes to customers whose accounts have been in good standing for at least 90 daysGizmodo: Unlocking the T Mobile G1... (September 24, 2008)
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The G1 will be available for $399 without a contract after the official October 22, 2008 launchEngadget: The T-Mobile G1 (September 23, 2008)
