This should clear this up. I just read the entire TOS, and it would seem that as long as you are using the USB tethering function you are fine, however they may be able to get you on section (e) of the following. On the other hand, most of us on these forums are guilty of (d) since many of us run custom ROMs or leaked OSes, and I don't think ANYONE has gotten terminated for that:"What Are Verizon Wireless' Rights to Limit or End Service or End this Agreement?
We can, without notice, limit, suspend or end your Service or any agreement with you for any good cause, including, but not limited to: (1) if you: (a) breach this agreement; (b) resell your Service; (c) use your Service for any illegal purpose, including use that violates trade and economic sanctions and prohibitions promulgated by any U.S. governmental agency; (d) install, deploy or use any regeneration equipment or similar mechanism (for example, a repeater) to originate, amplify, enhance, retransmit or regenerate an RF signal without our permission; (e) steal from or lie to us; or, if you're a Postpay customer, (f) do not pay your bill on time; (g) incur charges larger than a required deposit or billing limit, or materially in excess of your monthly access charges (even if we haven't yet billed the charges); (h) provide credit information we can't verify; or (i) are unable to pay us or go bankrupt; or (2) if you, any user of your device or any line of service on your account, or any account manager on your account: (a) threaten, harass, or use vulgar and/or inappropriate language toward our representatives; (b) interfere with our operations; (c) "spam," or engage in other abusive messaging or calling; (d) modify your device from its manufacturer's specifications; or (e) use your Service in a way that negatively affects our network or other customers. We can also temporarily limit your Service for any operational or governmental reason."