Apps not updating on Wi-Fi networks on my iPhone

Please reset your network settings.

Reset your network settings

>>If you're using iOS or iPadOS 15 or later, tap Settings > General > Transfer or Reset [Device] > Reset > Reset Network Settings.

If you're using iOS or iPadOS 14 or earlier, tap Settings > General > Reset > Reset Network Settings.

This also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you've used before.<<

If your iPhone or iPad won't connect to a Wi-Fi network - Apple Support

Reset everything

What happens on cellular connection? How fast and stable/reliable is your WiFi?

Why aren’t you updating on cellular if you have full bars? What error messages are you receiving when updates fail? Are you using a VPN or have a VPN profile installed?

Reset your phone . Settings ,general , transfer or reset phone

That would have been good to know. You can try a full reset.

Have you tried multiple WiFi networks? It’s possible you have a hardware issue.

You’re left with backing up your device and then erasing and reinstalling your system. Apple Support will be your best resource.

What iPhone model and iOS version is it on?

Make sure you device is updated to latest iOS version first.