So Verizon says not to do it of course, but whats the fun in that? I have a XOOM that was upgraded to 4G recently and I only have the 1GB tablet package on it since it is 90% at home on WiFi. I also just yesterday got a 4G Mifi Hot spot, since they are allowing people to get the adapter free and start a new contract when you upgrade to the 5GB package. Anyways, say I go on a trip and I know I am going to use the XOOM more and I don't want to screw around messing with hooking it up to the hot spot or for some reason I am close to going over on my 1GB or the hot spot is dead and I need more data.. Has anyone tried just swapping SIM cards? I am actually thinking of doing this on a more permanent basis since I use the XOOM more than I use the Mifi lately. I know when the 4G upgrade was first done a lot of people were taking their SIM card out of their TBolts and using them but that was a temporary thing. I am sure Verizon can tell what MEID is using the SIM, does anyone know if they will deactivate my account or yell. I mean why should it matter which device the data comes from.