No Signal in FL, but can't get iPhone to roam

scottuf

    New T-Mobile customer switched from AT&T. Recently have to travel between Ocala and Williston, FL and Gainesville.  Within about a 10 mile radius of Williston, my iPhone 6S and my wife's 8 both go No Signal. Roaming is turned on in settings. I thought T-Mobile came with roaming included in areas without coverage. The T-Mobile map shows spotty coverage in Williston, but neither of us can connect to T-Mobile or any other cellular company.  Please help. This could be a deal breaker for staying with Tmo.

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