Why iPhone 4S after updating new iOS. unable to on wifi

I have this problem after updating the new iOS. Went to telco. They told me to go QCD. Singapore apple agent.  They told me to apple hot line.  Apparently no help was given. I suspect my phone wifi was defective after updating.  My phone warranty was just due after one year 7 may. I was hope that QCD can give me a a replacement phone after talking to hot line help desk. But disappointed with the reply. I actually want to see if can just repair the wifi if possible. Who can advice me. ?

Did you already try to reset the phone by holding the sleep and home button for about 10sec, until the Apple logo comes back again? You will not lose data by resetting.
If this did not work, and to rule out a software issue, setting it up as new device would be the next step:
iOS: How to back up your data and set up your device as a new device
If still no luck, this might be a hardware problem and the phone has to be checked by an Authorized Apple Service Provider or Apple:
iPhone - Contact Support - Apple Support

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