I have a question about the policy of Verizon unlocking phones after 60 days. I upgraded and will be giving the phone to my mom with tmobile after it unlocks in 60 days. My question is this, is it enough if I put my current verizon post paid sim into the new phone and use it for a few minutes and then go back to my old phone or do I have to use the new phone for 60 days as my main phone for the 60 days to count? Thank you!