i have a nokia "dumb" gophone, it was unlocked about 9 months ago. I have a 1 year prepaid wireless plan. I just bought a lumia 635 phone but have not activated it.
can i switch the at&t sim from the old gophone to the lumia 635 and unlock it ? The reason I ask is i will be taking a trip to europe in september and would like to use a local european sim for the short vacation.
i would then return to the US, insert the at&t sim and continue the yearly plan. Thank you.