Using a Moto X purchased from Republic Wireless in the UK?

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http://forums.androidcentral.com – now that the Nexus is 5 is looking underwhelming in terms of its battery, camera, and non-worldphone LTE bands, i'm wondering about the Moto X. i read something about the Republic Wireless version needing to be hacked to work on GSM? also, does the Moto X have the right LTE bands for UK/Europe, or just the U.S. LTE bands? thanks! (HowTos)