Do any other phones have signal where you are? If not, it may be a network issue in the area. If only your phone is having the issue, I'd recommend Reset Network Settings, and going to Settings > General > About, and verifying that an ICCID is listed (that will verify that the phone is still communicating with its SIM card). If those check out, try going to Settings > Cellular > Cellular Data Options, and changing your Enable LTE setting.
Denken7, we want you to have the service you need. What ZIP Code are you located in?
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