My wifi just stopped working!

My Wifi just stopped working a few weeks ago.
I have a iPhone 4 and i´dont know what to do...
I need my wifi

Tap Settings / General / Reset / Reset Network Settings then restart your iPhone.
Press and hold the On/Off Sleep/Wake button until the red slider appears. Slide your finger across the slider to turn off iPhone. To turn iPhone back on, press and hold the On/Off Sleep/Wake button until the Apple logo appears.
If that didn't help, read here > iOS: Troubleshooting Wi-Fi networks and connections

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