Can you swap 4G sim cards from one 4G phone to another? I've got a Bionic right now and I'm buying the Nexus when it comes out, so I was wondering if I can put the Bionic sim card in the Nexus (or vice verse) and be good to go? One of the reasons I ask is that I intend to update the Bionic to ICS whenever it comes out, but I don't want to go through the hassle of deactivating the Nexus, activation the Bionic, updating, then deactivation the Bionic and reactivating the Nexus...man, that's confusing.