Q: Unable to join wifi at home

Try a hrad reset by holding the home button and on/off button for 10 sec until you see the apple logo.  Sounds like your router or setting issue.

Retarting your router can be beneficial.

Here are the recommended WiFi settings:
http://support.apple.com/kb/HT4199

Here are some troubleshooting steps for WiFi.

http://support.apple.com/kb/TS1398

I had the same issue. I was sitting in front of my router at home and it was giving me the "unable....join" message. It turned out that I had changed my password a few weeks ago, so I would get a choice of networks including my own...but when I tapped my home network, the window with "Forget this Network" at the top would appear. In case others don't know, like myself, you need to select "forget this network". It automatically erases the previous information....and then you can enter the newer password. I hope this helps. I did find this information buried in one of the links Trumania posted. So thank you!

If nothing else works, try entering a wrong password, then the correct one.

PLs help.. My new ipad and other iPhone 4S unable to join my home wifi network but my laptop and other iPhone is working

hi, my ipad air-2 64gb, 4G does not can't connect wifi again, I've tried many times using with reset option.but still no use.how to rectify please help me.