I'm sorry to learn that your iPhone 7 is not working as intended with cellular data, lindiloo. I know how important it is to have access to data when WiFi is not available. We are committed to resolving this issue for you. Share the nearest intersection to the trouble area, and also provide the ZIP code.
When did this issue start?
Do you see a specific error on your screen?
What is the model number listed on the back of your iPhone 7?