I am currently using verizon droid phone with me . the service of verizon is not good so i want to buy another service provider . now I want to switch to at&t as most of my friend are using at&t and they are saying its network is awesome . i want to ask what are the best cell phone model of at&t . and how to buy cell phones of at&t . i want it urgently send me the answer as soon as possible .