Iphone 6 won't connect to wifi .. Says incorrect password which is not true. Ideas???

I stayed up all night figuring this out and it finally worked. However, the apple support, nor my WiFi provider knew what to do. They are no help, and I agree with most of these posts, these products are too expensive to get such poor customer assistance. I hope my resolution helps... so here goes!

All you have to do is change the name of your network and the the pass code. I did this simply by just adding a number to the end of the current network name and the same number to the end of the pass code so it would be easily remembered. This will change nothing else. Unfortunately, everyone else will have to sign on again, but your devices will immediately pick up the new network name and it will work!

The hard part is that this has to be done through your IP address ( this information can be found under your network settings right on your computer under details), so you go to the internet and type in your IPV 4 router address just like you would type in a url, and it will take you to your server website.There you should have access to your WiFi settings to change this. However, it may ask you for a user name and a passcode to get access to your setting, and worst case scenario is you have to call your WiFi provider to help you out with this part, but whatever you do do not reset everything as this is what your provider will suggest..... That would be a nightmare. Just change the name of the network and the pass code, and it will work! I really hope this helps!