“my device is an iphone 6s, version i06 15.8.3. It automatically updated to version 15.8.3 recently. i have owned the device for several years, it has worked flawlessly in all aspects including wi-fi functions until it updated to 15.8.3. I do not have full wi-fi functions now, I am unable to determine what is the actual problem or how to correct it.”
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It could be many things. So, what exactly are issue you are having? Is it just certain networks? Or is it all networks?
Troubleshooting iPhone WiFi:
Try these thoughts:
A. Clear Temporary Internet Files:
If connecting is unsuccessful, try clearing out your Temporary Internet Files: History, Cache, and Cookies
Go Here: Clear your Safari Browser History and Set Up Content Blockers on your iPhone, iPad, or iPod touch - Apple Support
and...
B. Try manually restarting your iPhone:
- Go To: Settings
- Select: General
- Scroll to: the Very Bottom
- Select: Shut Down
- Slide Finger: to the Right
- Wait: 30 Seconds
- Power One: the iPhone
- Try this Once More
and...
C. Troubleshooting Connectivity:
Wi-Fi: If your iPhone won’t Connect to a Wi-Fi Network - Apple Support
and...
D. Reset your Network Settings:
- Go Here: If your iPhone, iPad, or iPod touch won't Connect to a Wi-Fi network - Apple Support
- Scroll To: Reset your Network Settings.
- IMPORTANT: Take some screenshots of your network settings so that you can have something to refer to when adding them back. Then, trash the screenshots when all is added back.