Wi-Fi and cellular data not working on my iPhone 12 after iOS 18.5 update

Have you tried and see if you’ll need to install a carrier settings update/

1. Make sure that your device is connected to Wi-Fi or a cellular network.
2. Tap Settings > General > About.
3. Follow the onscreen instructions to install your carrier update.

humbertocg84 wrote:

Same Issues. Continuos disconnections. Wifi can’t keep the connection for more than 1 minute. Mobile data plan has been very affected, before updating, the wifi was working as expected.

Try “forgot” wifi and reset Network settings. Nothing works

Do you have ANY 3rd party VPN installed, even if you are not using it? If so, delete the VPN profile in Settings/General/VPN & Device Management/VPN. Don't just turn it off; delete the profile. If that fixes it, you can try reinstalling VPN. 

I have a similar problem. When I’m off my home WiFi network, but WiFi is still on, data doesn’t work. If I switch off WiFi, data works fine, but kicks me off Apple Car Play. If I switch WiFi back on, phone connects to car again, but data doesn’t work.

You should really completely uninstall McAfee; delete the VPN profile in Settings/General/VPN & Device Management/VPN, restart your iPhone. You can add it back if you want to, However, VPN actually reduces your privacy, it does not enhance it, so you may want to rethink the reason you use VPN.

Here’s the long answer→VPN: What you need to know - Apple Community

It's not always the iOS update's fault!  Many things can cause phone problems.  If you tell people you think it's an iOS update, it might make it harder to fix or find a solution for the real issue.

Remember, the right question often leads to the solution!

Was/Is your device Jailbroken? If that's the situation, please be informed that attributing the issues to iOS updates may not be accurate.

iOS updates aim to enhance user experience, boost security, and fix bugs rather than disrupt core features. The majority of the issues after updates might stem from underlying, unmentioned factors. Updates won't typically alter personal data but may refine settings or features. Backup before major updates for safety. Review Apple's update details and backup advice for a smooth process.

Kindly consider checking your settings and addressing any device issues before attributing the issue to external factors. This could be a pure coincidence that the iOS update affected the iPhone functions.

Before initiating a standard iOS update, it's advisable to create a backup. Have you completed this step? If yes, proceed with the restoration from the backup.

See what each update does: About iOS 18 Updates, About iOS 17 Updates, About iOS 16 Updates, About iOS 15 Updates, About iOS 14 Updates, About iOS 13 Updates, About iOS 12 Updates, and so on...

I have the similar issue:

Wifi doesn’t work when cellular data is on, when i switch off the cellular data the. Wifi works.

Before 18.5 it was seamlessly working.

Do you have a 3rd party VPN installed, even if you are not using it? If so, delete the VPN profile in Settings/General/VPN & Device Management/VPN. Don't just turn it off; delete the profile. If that fixes it, you can try reinstalling VPN. 

Cherian-262 wrote:

I have the similar issue:

Wifi doesn’t work when cellular data is on, when i switch off the cellular data the. Wifi works.

Before 18.5 it was seamlessly working.

I will suggest what worked for others who posted in the thread you just added to:

Perhaps a long shot:

Do you have ANY 3rd party VPN installed, even if you are not using it? If so, delete the VPN profile in Settings/General/VPN & Device Management/VPN. Don't just turn it off; delete the profile. If that fixes it, you can try reinstalling VPN. 

SashaRed wrote:

same issue

removed VPN profiles

reset network settings

restart iphone

useless

ios 18.5 iphone 15pro

If it is just Wi-Fi restart your router. If it is both Wi-Fi and cellular your phone is broken; contact Apple for repair options.

Same Issues. Continuos disconnections. Wifi can’t keep the connection for more than 1 minute. Mobile data plan has been very affected, before updating, the wifi was working as expected.

Try “forgot” wifi and reset Network settings. Nothing works

RachelK01 wrote:

I have a similar problem. When I’m off my home WiFi network, but WiFi is still on, data doesn’t work. If I switch off WiFi, data works fine, but kicks me off Apple Car Play. If I switch WiFi back on, phone connects to car again, but data doesn’t work.

Do you have ANY 3rd party VPN installed, even if you are not using it? If so, delete the VPN profile in Settings/General/VPN & Device Management/VPN. Don't just turn it off; delete the profile. If that fixes it, you can try reinstalling VPN. 

OK, VPN is out.

The most likely reason is your Wi-Fi connects to a Wi-Fi network that does not have an internet connection. This might be the Wi-Fi in your car if you don’t have a data plan or the network is unstable. Does this happen everywhere, or only in the car?

Rather than turn Wi-Fi off, open the Control Center by dragging down from the battery icon, then tapping on the Wi-Fi button to turn it white. This will disconnect from the current network, but will not turn off Wi-Fi completely.

Also, if it is only with your car open Settings/Wi-Fi, tap on the i next to the car’s network and tap Forget This Network.

I just had this exact problem! When I turned off the VPN, everything went back to normal. I will not use VPN any longer. Read the article. It’s quite interesting!