4G not working on iPhone 8 plus

I see.

I would try to reset your network settings (this operation deletes all the wifi passwords, but nothing else):

Settings>General>Reset>Reset Network Settings. When done, restart your iP8+, then test it for a while.

If you're using a case, please remove it from your iphone , then test it to check if that case could obstruct your antenna efficiency.

If nothing changes, then I would make an appointment at the Genius Bar.

Regards

Giulio

I have the same problem with my i8+, the 4g network usually not working in my office, and the signal changes from very week to strong repeatly. What I can do is turn off 4g and using 3g network in my office.

Is this still happening only when you're using the iP8 at home? Have you already talked to your carrier?

It's difficult to diagnose this kind of issue remotely, and if this is always happening at home, I can only think of something that can interfere with the 4G signal at home (but I can't say what).

Can't you use a wifi connection at home (instead of the 4G signal)?

Regards

Giulio