in case of an international trip, passport number can be used to register one free phone per person per year, is this valid for 3 months after the trip? like I'll be back to Pakistan from Turkey on 3rd November, so i can register one phone for free for next 3 months bought from any country? phones here in Turkey are very expensive so I'll get one from US, just want to know if I can register it for free during 3 months time.