Can anyone help me I have set up my home wifi on my iphone and it was working fine but all of sudden it says not connected. So I put the password in and it says unable to connect to wifi so it uses my mobile data. I've tried deleting the wifi but I seem not to be able. Has anyone had any problems like this and also can someone help meeee!!

First try turning WiFi off and on again.

If that doesn't help, then try this -

Settings > General > Reset Network Settings

We had a problem at work recently when a colleague's iPhone refused to connect to a WAP which had, until that day, had no problems. We rebooted the WAP and everything was fine again so I suppose rebooting your router may work.

My phone does this sometimes. If I leave it for an hour or so and it re-connects by itself.

When that happens to me I reboot the router.

First rule of solving any kind of tech problem, switch it off and switch it back on again - both the phone and the router.

It solves 90% of problems!