No

This isn't exactly right... it uses airtime while transferring data, but I don't think you are billed for every second your surf. In other words, if I bring up my hotmail and download an email from someone, I don't actually get charged for the whole time I'm reading it, even if I set the phone down and come back to it a few minutes later. Watch for the little phone icon on the display. When that's solid or blinking, you are being charged airtime.