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I don't use tethering because I have no need for it, but from what I've read, most people are unwilling to pay AT&T because they're charging you for accessing the same amount of data you've already paid for, but in a different manner. It's akin to an ISP charging for using wireless instead of Ethernet. I think that if AT&T gave people a good reason for the $20 charge (such as additional data for tethering), then the use of MyWi would decrease. As it stands, it seems like AT&T is charging for something their customers have already paid for. I guess I'm wondering how you steal something you're already paying for.