Cell phone dead zone

Today is Wednesday the 24th. Jenny and I will be leaving our campsite in Larson's driveway in a few hours. We will be camping in Lost Maples State Natural Area until the 27th. The campground is in a Valley and there is no cell service. I know that because we have been there twice before. The ranger station supposedly has wifi so maybe we can get something there. The park is near Vanderpool. We will be back online on the 27th