[feliciano]

I do have a Verizon fathom bought in Brooklyn but used in a overseas 850 GSM provider.
No problem whatsoever, just insert my SIMcard from my old phone, turn it on, choose not register in my home Verizon CDMA partner, set it to GSM mode (with some annoying global switch pop ups everytime I enter into a basement) and enjoy my fathom. No need to unlock anything since is already factory unlocked (I mean the GSM part of it).