It is indeed possible, with a little work... I would recommend unlokcing and switching to a AOSP ROM (there are lots available and they are fairly simple to install), setting a few APN settings and pop in the SIM are all that is really required. Note that the Rezound does not support LTE on AT&T's network, the best you can do is HSPA+ but that seems to be hit and miss for people, some people get it and some don't (this might be due to the frequencies used in varying markets). Also, the radios for GSM in the Rezound do not seem as "polished" as the CDMA/LTE radios, so signal strength has been an issue for some people, others not so much.When my contract is up with Verizon I am thinking about switching to AIO Wireless. It's a new prepaid using AT&T network. LTE is available in my area. Is there anything that I could do to use my Rezound with AIO?