Today I’ve got great news for you! Fire phone is now unlocked and you can buy it for $199 (saving $250).
It includes a year of Prime and is compatible with all GSM networks.
Those of you who bought Fire phone for its initial price ( $649) soon before the price drop can ask Amazon for a refund (and they are likely to get it).
If you bought your Fire phone unlocked, here is a short tutorial of how to unlock it.