Default [Q] Tethering

Hi, I have an unlimited data plan with Verizon. I want to tether through my phone to run my computer. I bought a rooted phone (an old HTC Thunderbolt) & can't seem to do it. The phone? Me? Probably me. Anyway, can I buy a phone off of this site that is totally ready to tether through? Or does this have to be done after the phone is activated? Thanks! Bill

I see I posted this in the wrong place. I reposted in questions & answers. Can someone please delete this? Thanks!