I remember several years ago, people said the one advantage of AT&T over Verizon is that you could be on a call, then press the home button and start using any internet app while talking. AT&T let you do both voice and data at the same time. Verizon did not. Is that still true today? Does Verizon still not let you do voice and data at the same time? What about T-Mobile? I am going to get a new iPhone soon and am thinking about switching to either Verizon or T-Mobile.