Why is my iPhone not connecting my Wi-Fi?

I just recently moved into a new house. And I soon realized that their was Wi-Fi in my house titled "dlink"
I've seen this public Wi-Fi before at an old house of mine.
Well anyways. It's been working fine for a a couple weeks now. But today around 12 I came home and my phone wouldn't connect to the Wi-Fi.
It just does that little loading sign, and it doesn't stop. It just keeps going, can anyone help?

Have you tried resetting your network settings? To do so go to Settings>General>Reset(all the way down at the bottom)>Reset Network Settings

This will remove saved networks that you currently have on your phone, but this is kind of what you want in this case.

Or have you tried restoring your iPhone to factory defaults using iTunes? I would back it up first, so you don't lose contacts and all of that other jazz while restoring.

I would reset the network settings first and use the restore as a last ditch effort.

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