I use West Central Wireless out of San Angelo for service. They have a 3G system that works great for us. Their local guy in Kerrville will come out and check to see if the signal is strong enough where you are before you sign up. I have had their service for 6-7 years and haven't had any issues other than a brief outage every other year or so.
Just went through this at our lease. Reach out to the local internet providers about getting a satellite set up by your cabin. We got tv and internet that way, after splitting between the members it's very affordable.
I have heard good things about West Central Wireless as well. Just bought a house west of Fredericksburg and was planning on using them so I'll find out in about 2 weeks when we move in if they are worth a damn. There's also Bee Creek in FBG but I've heard mixed reviews on them.