iPhone 14 Pro internet connection and cellular problems

My iPhone 14 pro that I got about four months ago, says that I have three bars of AT&T 5G service but when I go into apps like YouTube and TikTok that require an internet connection, the app says I’m offline or not connected to the internet. This started happening yesterday and I have searched for many different solutions and none of them have worked. I have restarted my phone multiple times, turned my cellular and Wi-Fi off and then back on, and tried resetting my network connections and none of these have helped. Any way to fix this would be very much appreciated because at the moment I can’t do much more to fix it.