My iphone 6 doesn't conect to the Wi-Fi anymore?

It was connecting normaly before but today it disconnected suddenly, I tried to restart the home Wi-Fi, restarted my iphone, I tried to reset the network settings as well, I changed my DNS but nothing seems to work.
My ipad and my mom s iphone 6 plus works perfectly, why only my iphone is having this problem?

Go to settings, Wi-Fi, find your Wi-Fi and press on the i with a circle around it, then press forget This network, then press forget. Hold the off button and the home button at the same time for 10 seconds. Your phone should turn off. Now reboot, connect to your Wi-Fi and enter the password

This is why you must remove the phone from the system in the correct manner. Warnings are not to be ignored. You have corrupted the operating system by incorrectly removing the phone, so it's your own fault.

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