A while back I was reading that the big problem T Mobile users had with their iPhones was that the chip in the iPhone was not meant to be used efficiently with the low band frequencies that T Mobile had bought and was trying to use. Other phones were just fine with them, like Samsung and other 'droids, but the iPhone would have to have a new sort of a chip to use T Mobile's frequencies. Then I heard that with the iPhone 6S all that had changed, that Apple had fixed the problem and come out with a chip which could handle the T Mobile low frequencies. I asked my husband (he has the 6S and I have a 6). He said that he gets fewer dropped calls, he thinks. How about you? Have you noticed any improvement in coverage with the 6S or heard about Apple improving their chip so it works better with T Mobile? I haven't but this topic isn't very popular in general so I suspect no one has been rushing to write it up.