Internet not working on my iPhone 15 Pro Max after iOS 18 update
No Internet on 15 pro max after updating to IOS 18.
[Re-Titled by Moderator]
iPhone 15 Pro Max
If you mean via Wi-Fi, perhaps this will help:
If your iPhone or iPad won't connect to a Wi-Fi network - Apple Support
If you mean via cellular, make sure that Cellular Data is turned on in Settings -> Cellular. If that is on and toggling it off and back on doesn't help, you may need to talk to your cell carrier.
Regards.