Updated latest ios 9.3.5 now my wifi not connecting

I spent a whole day trying to fix this issue with my iPhone 5 and before I found this answer I never realized that the VPN app that I installed to avoid ads from downloading could be the problem.
Thank you!

Below is a User Tip about Wi-Fi issues. Suggest starting from the top and working down.

1) Restart you device.

2) Reset Network Settings: Settings > General > Reset > Reset Network Settings. Rejoin the Network again.

3) Reboot Router/Modem: Unplug from power for 2 minutes and plug again. Update Router Firmware (check manufacturer’s support website for a newer FW). Also try different bands (2.4 GHz and 5 GHz) and different bandwidths (20 MHz recommended for the 2.4 band). Channels 1, 6 or 11 are recommended for the 2.4 band.

4) Change to Google's DNS: Settings > Wi-Fi > Click on the Network, Delete all numbers under DNS and enter 8.8.8.8 or alternatively 8.8.4.4

5) Disable device prioritization on the router if this feature is available. Also disable any VPN apps and test Wi-Fi again.

6) Determine if other Wi-Fi devices on network are working well (other iOS devices, Macs, PCs).

7) Try device at another Network, i.e., neighbors’, public coffee house, etc.

8) Backup and Restore the Device using iTunes. Try restoring as New first and testing it. If ok try restoring the backup (the backup could be corrupted).

https://support.apple.com/en-us/HT201252

9) Go to an Apple store for hardware evaluation. The Wi-Fi chip or the antenna could be defective.

User Tip: https://discussions.apple.com/docs/DOC-9892

Hi

Follow the steps here:

• If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network - Apple Support
• Connect to Wi-Fi on your iPhone, iPad, or iPod touch - Apple Support

I have this problem with my ipad.Not beeing able to use wifi.i checked the router,all is fine.My iphone is connecting wireless without a problem.I tryed to create a hotspot on iphone and when i connect ipad is working so i do not think is a deffective antena.

I restored my ipad,i tryed to forget network,put different dns,reset network settings,switched off localization on it.

Do not know what to do to make it work,because now is just a piece of furniture.

Thank you.

Try to lightly reset your iPhone. It can help.

I too have a similar problem, my Wifi connection drops and when I try to connect, it does not detect my hotspot.

I have same problem.

Just try to use static IP for your wifi setting on your iPhone.

I can avoid this problem when using static IP.