Good afternoon all, I just bought an iPhone 4S and paired it with T-mobile, which, on the coverage map, shows that I am well covered in and around my immediate area. For some reason my phone keeps going back to Edge, and I rarely get the "4G" signal. My questions is: if I had an iPhone 5, would I get better data speeds, since it would be built to run natively on T-Mobile's network? My last day to return/exchange it hassle-free is today. Thanks.