Wifi problem iphone 4s

i can turn on or off the wifi in settings(its not greyed out) however doesn't show any network so i am unable to use wifi. is this a software or hardware problem? it seems the problem start after update 7.1.1.

Hi sergionyc1,
If you are having WiFi connection issues on your iPhone, you may find the troubleshooting steps outlined in the following article helpful:
iOS: Troubleshooting Wi-Fi networks and connections
http://support.apple.com/kb/TS1398
Regards,
- Brenden

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