The major applications are data only, some still allow you to do SMS. SMS is not as reliable as data. Whenever the device communications with the data network, data charges may apply and in some situations, applications must check the status of the data network and that may involve a charge. When sending/receiving a message it hits the data usage dude.
The best answer is to get an unlimited data plan.
Ben
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Treo Centro - Honolulu - 2,500 miles west of somewhere in the middle of nowhere, the land of Shakes. Kyoceria 6135, Treo 300, 600, 650, 700p, 700w, Centro & 800W + 3 other WM phones...
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