Alright so I just remembered today that when i purchased my Thunderbolt, the guy at the verizon store put in a SIM card and said all the 4G phones will now have a SIM. So i just thought about this today. AT&T allows people to switch phones by just moving the SIM card from one phone to the other. What if i were to take out my SIM and put it in another 4G verizon phone. Would i be able to use that phone with no problems and no need to contact verizon.