I HATE that I'm ressurecting an old thread
It's appropriate in this case, I think. While somewhat dated, the older posts are still relevant.
I'm still tethering on Verizon. They've caught on, though. Kind of. Back in October they increased the price of the data plan for those few who are still grandfathered on the unlimited plan. It went up $20. If you use less than about 10 GB a month, then changing to a tiered plan is a better deal now. But I use way more than 10 GB in a month. I used 74 GB in December. 40-50 gigs is probably normal.
Last year they stopped throttling me (unlimited data plan users) on 3G data. That was right after they got a sternly worded letter from the FCC Chairman wondering why "unlimited" didn't mean, you know, "without limits." Verizon had already announced plans to throttle 4G users (but just the unlimited ones), as well, and the letter caused them to scrap that notion. In October when Verizon announced the price increase, the Chief Financial Officer, Fran Shammo, stated, "For a customer who signed up for unlimited, they're going to get unlimited," Shammo said. "But we are increasing the price. These customers are consuming a lot of data. But we're not in the habit of throttling customers." He added that last part, despite the fact that until Verizon received that FCC letter, they were in the habit of throttling.
I pay for
Nationwide Talk 900 - $59.99
Email & Web Unlimited - $49.99 (used to be $29.99)
500 MSG Allowance + UNL IN MSG - $10.00
The Nationwide Talk 900 is for 900 minutes, but the overwhelming majority of my minutes are to other Verizon customers, or to the 5 numbers in my Friends and Family thingy, which don't count towards my minutes. Same thing with the 500 text messages. I usually end up with less than 100 minutes and less than 50 texts that count towards the limits. I'd like to change to an unlimited Talk and Text plan, but of course I'd lose my unlimited data plan. It's way cheaper to keep that I've got.
Sprint will throttle the unlimited data plans when they reach 23 GB of data in a month. T-Mobile is the same. AT&T throttles like crazy. You should be fine tethering on Sprint, up to the 23 GB mark, anyway.