My iphone 4s doesn't recognize the home wifi

Hello,
I bought a new iPhone 4s 3 months ago and updated the software. last night, when i got home, it did not connect automatically to my home wi-fi, as it always does. instead it showed a small circle in the screen  where thw wifi wave signal was before( it is working on 3g). the problem is it doesn't show the home wifi in the list of available networks. I tried switching on and off the wifi and suddenly it went inactive( gray and didn't turn on anymore). I switched off the phone and when i tried in the morning the button was working again and it connected to the home wifi. when I unlocked the sim card, it showed the small circle again and doesn't show the home wifi anymore and it just says not connected. I tried searching the name of my home wifi but it can't find it. my other iphone 4s with the same iOS upgrade works perfectly and connects to the home wifi automatically( no problem at all). my two iPhones are working with the same telecommunication network, and until last night they both connected perfectly.
could you please tell me how to fix this?

Could try this
This worked for me - after trying everything else!
I wish I had of tried it first!
One of the most common complaints we are hearing from users is that they have been unable to access wi-fi and Bluetooth after installing iOS7.
Here is something you can try:
- Change the name of your device
The new operating system seems to have an issue with apostrophes. At least when it comes to wi-fi.
Check out your device name. If it is called something like “Claire’s iPhone” it could be the apostrophe that is causing the problem.
To change your device name go to Settings > General > About > Name. Tap on the name to edit it and remove the apostrophe. Save the change. Switch off your phone and then switch it back on again.
Your wi-fi should be working (could be working)

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