I am s BlackBerry user, but I am eligible for an upgrade on my Verizon account, if I purchase a 4S for $199, have it unlocked by Verizon for overseas use (I have been a subscriber for a decade, so the 60 limitation doesn't apply) and then give it as a gift to a friend overseas, and then reactivate my current BlackBerry on the Verizon network when I get back to the US, are they any potential pitfalls or problems that I am not accounting for? The phone should work for her indefinitely on her local GSM network with her SIM, correct? Please let me know if I am missing something in the equation. Thanks!