My iphone 4 won't connect to my home Wi-Fi? - 2

I have a iphone 4 (with no sim card) and tonight my phone froze (which happens sometimes for me) and i did the holding to home and power button which i always do but this time it wasn't connecting to my Wi-Fi and i tried to put in the password a couple of times and then i reset my network setting and tried a lot more times but it still says unable to connect and the little Wi-Fi symbol is all blacked out and i don't remember it being black, and my laptop is desktop is connected and i've turned my router on and off

Don't use the Wi-Fi for a couple of hours and then later on use it and see how it goes.

This happened to my sisters phone, i changed the Wi-Fi antenna and a weak later it happened again and we took it to apple and they wanted $100 to fix it so we just bought a new phone

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