No Data via Cellular iOS 10.2
Like all data issues, your best bet is to contact the carrier. They have access to your account, the cell tower logs and diagnostics and can resolve service issues most rapidly. 


https://support.apple.com/en-us/HT201415


Steps to fix service issues in rural American is generally different then in the city in the United States. As is Europe and Asia and around the world, each region and each carrier has different ways and levels of serviceto troubleshoot and help you.