Unless its wireless modem/router combo from AT&T. Something like this, only for cars:I really doubt if it is AT&T's problem. AT&T shouldn't care about the router piece of the head unit, they should only care about the modem piece. Just like your home network where you have a modem and router - your ISP is in control of the modem connection and you are in charge of the router piece. So AT&T shouldn't have anything to do with the Network name and password changing (at least that's my thoughts). It should be something Nissan has to fix. I just don't know how to get this info to Nissan except through the dealer and they aren't much help in regards to this issue.