Unlock Sidekick?

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My friend had service with TMobile a while ago. He no longer has service with them anymore, but still has his B&W TMobile Sidekick. I know its possible to unlock phones, but realize it might be different in this case because its not exactly a regular phone. He uses it for the organizer, im not sure if he'd want to go online with it or not. Would it be possible for him to sign up with AT&T prepaid since he wouldn't use it as much, take the sim card out of the phone that it comes with with the prepaid service and use it in the sidekick? I assume the sidekick would have to be unlocked first (is that even possible) so it can be used across networks?

If its possible what would i need to do it?

Just wondering if its possible, tryin to help a friend out,

Thanks,

~J

Send the phone to me, I will unlock it for you!