Bluetooth Activesync Data Usage?

[manifest3r]

I have recently been syncing my phone through Bluetooth Activesync to my computer and tethering data from my computer. My phone's line does NOT have a data plan. I am currenly being billed 8835KB data usage, at .03/KB. My question is: Is Sprint able to charge me for tethering my computer's data to my phone without using THEIR data network?

P.S. My phone did once disconnect from activesync and started using Sprint's data for about 26 minutes, while I was browsing the internet. I have since then disconnected sprint's #777 to #555 and it has not connected to Sprint's data network.

[hooover]

any form of data usage is detected not only that anything over a certain amount on downloads is extra charge even on unlimited data plans.There is some form of restrictions applied to data usage regardless of your provider!!!