those big cell phone providers being the same ones providing the data network to carry the voip calls, of course. it wouldn't be a stretch for at&t to claim th

those big cell phone providers being the same ones providing the data network to carry the voip calls, of course. it wouldn't be a stretch for at&t to claim their feeble network can't support voip and block it or just deprioritize voip packets enough that the calls are not clear.