Nothing. Park users, especially mountain hikers and bikers, need good communication to get help in case of an accident. I understand all carriers have very poor to no coverage up here. Certainly, not one is reliable.

Mostly bad reception. Some parts of Frederick are dead. Sprint plays hard ball. Expect no sympathy and no getting out of your contract, sucker!

The service never drops out only because the tower is about 1.5 mi. Away

I had Sprint for six months after I moved up here, and it just wasn't acceptable. I've had Verizon fov over a year now. It has much better reception in rural areas, and I have had very few problems with dropped calls anywere (although there is a black hole on Rt. 340 between the Maryland/Virginia state line and Frederick). Verizon simply owns over everyone else in the area, even in DC and Baltimore (I spend quite a bit of time in each). I had an Audiovox flip-phone for a while, and usually had between three and five bars, although I often recieved no reception inside. I just got my Kyocera, and I almost always have four bars (the max on this phone), and many fewer problems indoors.

AT&T Wireless has dropouts at the following locations along Interstate 70: at the Baltimore County line between the Beltway and US29. Near Turf Valley (where US40 comes in and joins, near mile 82). At the Frederick County line near Mt. Airy. Near Spring Ridge (Mile 59). Near New Market (Mile 62). Along US340 and US15, there's a severe dropout atop the ridge near Jefferson, MD - the call will drop every single time and 200 feet later you'll have five bars. I've been with AT&T for three years and this has never changed in the slightest.

I travel between Frederick and Rockville, MD every day for work and I never lose reception while driving within Montgomery county and Frederick County. I even drive a lot between Frederick and Hagerstown and have never lost a signal while on I-70. I can use the phone anywhere in my house in Frederick, friends' houses in Hagerstown, malls in Frederick, and even in my office building in Rockville. The Nokia 3650 I use is amazing and always has at least 3 bars for signal no matter where I go it seems, which is a lot better than AT&T service around here. If you live in Frederick, definitely check out T-Mobile and the Nokia phones.