No service on iphone 8 plus

I have a problem with my iphone 8 plus. It says no service and I have tried restarting it, toggling the mobile data and airplane mode tool, taking the sim card out and in again and trying the sim card in another phone where it works perfectly fine. When I check the mobile data settings, I can see the network provider that I am using, but it still says no service. How can I fix this? I have the recent software update 13.4.1