I'm in Door County every other weekend. The towers in Fish Creek and Sister Bay have been updated to band 25. It really depends on where you're staying. I stay near the corner of Cty Rd Q and Hwy 57 near Sister Bay and I can only get 3G which is mostly unusable. Go a half mile up the road and you'll get LTE from the 1 tower in Sister Bay. Ephriam is horrible unless you're phone will roam on US Cellular LTE. The terrain really hurts the signal, it's too hilly.