Data over normal GSM call

[Dan Staley]

Does anyone know if it is legal (in the standard TOS) with providers
(such as ATnT) to send data over a normal phone call?

I have plenty of cell minutes (not to mention free calls between certain
numbers...) but I dont want to pay for a data plan....so I figure if I
wanted to, I could just have my phone call my computer and transfer data
over the line.
Has anyone else looked into this?

-Dan Staley