Why can't I join my Wi-Fi on my iphone 4?

When I woke up this morning I tried to connect to my internet and it said "unable to join Wi-Fi" u checked the router and Motom an everything was working

Switch your router off and back on after three minutes. Do the same with the phone and try again. If that doesn't work, open network connections on the computer and check the trouble shooter for network problems. Come back with the results if necessary.

If you turn off the wireless connection then turn it back on. There should be a button that says 'Wireless on/off"
If the doesn't work
Try turning off your router for a few minuets, then turn it back on.

Hope it helps!

Restart your IPhone and Try again.
Try giving the manual IP on your IPhone for connection with your Wi-Fi.

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