I have ATT and I am the primary with the 3gs. I used my upgrade a few months ago to get my wife an Atrix since her upgrade wasn't available at the time (it now is). How will this affect me pre-ordering the 4gs? When I click on the upgrade 'tool' it says upgrade not available on my line but is on her line. Is that something I set up when getting the phone? I just don't want to get the phone and it be locked on to her number. I don't really know how the sim card stuff works.