Many iOS users are suffering from iOS 7 update. The iOS 7.0.2 update does fix the lockscreen security vulnerability; however, this seems far from being enough as the iOS 7 Wi-Fi issue is still bothering a lot of iOS users.
Gustavojosedf77 from Apple forum complained that "After upgrading iOS 7 on my iPhone 4S, the wifi is not working. It cannot detect any wifi nor am I able to enable wifi under settings. Is there a way for me to fix this?"
Problems like Wi-Fi doesn't work with iOS 7, iDevices cannot access Wi-Fi after iOS 7 update and other iOS 7 connection problem also trouble you a lot? Here is several trouble shooting tips for you.
Updated: It's reported that iOS 8.2/8.1/8 has the same issues. In this case, you can also use the following tricks to fix iOS 9.3/9/8.2/8.1/8 Wi-Fi problems.
The Wi-Fi connection issue may be caused by wrong network settings. As a result, you should reset network settings.
If your issue is still unresolved, perform a software restore in iTunes.
If Wi-Fi still not working after you reset the network settings, you can try to change APN settings.
Those who have updated their devices to iOS 7 and cannot access Wi-Fi should change their iPhone's name. The latest firmware reportedly has some issue with apostrophes, so deleting an apostrophe in the device's name will solve the problem. This is also true with iPad and iPod touch.
If all the instructions are followed strictly, the Wi-Fi hotspot not working issue after iOS 7 update should be resolved. You can also check How to Fix iOS 7 Battery Drain for more info relating to iOS 7.