HONESTLY,
I USE ALLTEL AND I THINK IT DOES REAL WELL.....THING IS, IF I AM ON THE BANKS OF THE LAKE, THE TREE'S SEEM TO BLOCK THE SIGNAL, BUT IF I'M ON THE LAKE IT PICKS UP PERFECTLY....OR ONCE YOU GET AWAY FROM THE LAKE IT DOES WELL...........GOOD LUCK!!!!!!!!!
I had a company phone through US Cellular which worked anywhere down there. This was about 3 years ago. I have Nextel now and can't get a signal much passed Brookneal.
I have a Verizon flip phone not top of the line I guess you could call it midrange, works fairly well at the Clarksville end of the lake not so well up around the damm, try changing the roaming options, with a nationwide plan there is no real "roaming" , also try updating your towers as you get close to the lake made a big difference with the three phones on my plan.