IPhone 5s not connecting to Home Internet?

I had called AT&T, Frontier, & Apple
All had told me today that the sercurity settings on my Wi-Fi are blocking the connection to my iPhone 5S
Is that possible?
Because I had called AT&T today & someone else said that's not true, that it's the phone causing the problem
He said there's no way to block certain devises
I have multiple devises connected to my Wi-Fi, this is the only devise having this problem so can it really be the phone it self?
If so what can I do?

Could possibly be the phone. You would need to go through the security settings on your wireless and check for anything like mac filtering. Then clear your wireless network of your iphone and reconnect.

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