Who I have the same questioned this topic

I also started having this issue 2 days ago.

Details are:

• Galaxy S10+
• Zip code 37801
• Nearest intersection: W Hunt Rd. / Middlesettlements Rd. 
• Network on LTE / CDMA
• Full/partial 4G/LTE bars, but websites/apps say I'm offline

The order I tried to resolve was:

• Manual restart
• Airplane mode on/off
• Factory reset
• None of my attempted steps have resolved the issue. As soon as I disconnect from my home's Wi-Fi, I'm lucky if I can get internet service on my phone again until I get back on Wi-Fi.

I'm not sure what else to try, but looking at the responses in other posts, it seems like people have been having this issue for a while.