Originally Posted by
surfguy7
My wife's iPhone 6 gets noticeably worse reception than my iPhone 6s - same provider, same location. This happens over and over again in different countries with different providers as we travel. Not all antenna are created equal and some devices may be able to give more power to the antenna receiver.
The 6s supports significantly more LTE bands than the 6 so depending where you are, you may see a major difference.
http://www.apple.com/iphone/LTE/#iphone-6-iphone-6-plus