AT&T is the best provider in Myrtle Beach hands down. Alltel was terrible for a cellular carrier and Verizon was pretty bad for a PCS carrier. Now that they have merged, things really haven't improved much IMO. Even in super rural areas outside Myrtle Beach, only GSM works (T-Mobile fka Suncom isn't bad either). Other areas of the states, I have no idea. You won't regret at&t in Myrtle Beach though. While At&t is PCS, they have so many sites, congestion is low and signal is really reliable.