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It will obviously be locked to T-Mobile. Only the ones from Apple themselves are unlocked.

If it is using a genuine version of Android then it should be a true Desire. Usually the Chinese clones copy the physical look but for obvious legal reasons they can't do the same with the OS.

The Nexus One is no longer available to consumers. It is only available to Android App Developers & even so nowadays they are having a hard time getting one.

The Fascinate is not available as yet.

Alltel is essentially dead, being bought out by Verizon, so they are in the process or transitioning to Verizon.
Verizon getting the iPhone has been a rumor as of late, but most think it would be...