I just switched from Sprint to ST using AT&T. I was using Youmail as my voicemail provider on Sprint. I'm trying to set it up on my new phone and service, but I'm not sure if I need to pick AT&T as the carrier, or should I choose AT&T-Cingular? I'm assuming that Youmail will work on ST-AT&T. Is anyone else using this service, or is everyone using Google Voice?