My wife and i both had iphone 4s' from launch. She still has hers, but i moved on to android since the display was too small. We both tried the 5 and later the 5s, but the cell reception was horrible. By horrible i mean the phone wouldn't even ring or makes calls in the same areas where we get very adequate service on our 4s and android phones. We're on at&t in a decently large suburban area with lte service here and there. We desperately want to move on to the iPhone 6 from the 4s since its camera is pretty subpar compared to todays phones and we take tons of pics of the kids. The 5/5s were untenable for cell service. Has the 6 fixed the issues?