Ever since I received by brand new AT&T 7+ 256GB MB iPhone, I've noticed that the WiFi in the phone wasn't acting right. I have a high speed wireless network where I live and have never had problems with my iPhones before. As I was restoring my previous iPhone image to the new phone and the phone was downloading apps, I noticed that it was really slow and then would just stop working. A turn off of WiFi and then turning it back on would make it go again for a bit, but it would quit again after a bit. Doing speed tests would be erratic as well, however, on my wife's 6S, things were fine. I noticed ping time latency of the 7+ to go from 2ms to beyond 6000ms with 25-50 percent packet loss with the phone on and plugged in. My wife's 6S got 2ms-100ms with NO packet loss. I also discovered the hissing people are complaining of is actually the WiFi radio transmitter at the top of the phone. While doing the speed tests, it would hiss like crazy. After the test completed, it would settle down. If I turn WiFi off, the hiss goes away even if I use a CPU intensive app. Turn WiFi back on...hissing. Speed test...big time hissing! I can't have a phone where the WiFi is this unstable. I will return it to Apple for replacement as soon as there is enough stock. I wish I had kept my 6S at this point. Anyone else having this issue?