No service
i am using iPhone 7, last time i updated my ios to ios 12, my cellular data started to become ERROR, i can't use my cellular data cause it keeps saying no service in my bar. The first time, i try to reset my network settings and it works, my phone started to work as usual. But after a weeks it came back to an ERROR situation, so now i can't make a call, or anything else with my cellular data, i need to always use WIFI and it sucks. Please help me anyone:(
iPhone 7, iOS 12