i had an iPhone 6 Plus with iOS 10.0.2 and had zero issues with my wifi. When I got my new iPhone 7 plus, my wifi goes in and out. It always shows full bars, but when uses apps or the internet over wifi, it takes very long. For example my clash Royale game will pop up the little wifi symbol and flashes showing it's not connected. Never had wifi issues on any devices in over two years on any device. I have a TP-Link wireless router, if that makes any difference. I have tried a lot of things, including completely restoring the phone from iTunes as a new phone. I even had apple give me a new device, am still having issues. I updated to 10.0.3 also. It has to do something with my router I'd guess, but I don't have any fancy setting on there and when I run a speed test it's 15MB. Any help or suggestions would be greatly appreciated. Thank you in advance.