People looking for fast unlimited tethering for free are the very reason why limits are set by the carriers and ends up not being limited nor free.
If this is an important feature for you, spend the money to actually buy the function. if you rely on it solely you are helping to screw the rest of us down the line when it gets abused
This response is so condescending it is not even funny. People that pay for unlimited plans should be able to use their 'unlimited' plans anyway they want. The only phone that offers free tethering (wireless) is the Nexus S (4g). So, you can (happily?) pay the $30 a month or you can get a Nexus S 4g.
Personally, I was struggling to decide on which phone to get. The Evo 3d has the power and the whole 3d thing, but I went with the Nexus. Not only is the 3d effect uncomfortable, but having free tethering out of the box (without rooting) was important to me. Besides, the Nexus is extremely quick, has video chat on gtalk, and is the most up to date with Android OS. By the way, the video on gtalk is much better than video calling on Skype. In regards to tethering v. 3d, to be fair, I rarely use the tethering, but it is still more useful than the 3d effect.
By the way, the battery life of the Nexus seems much better than my original Evo 4g. In the end, both phones are good, I really like the hardware benifits on the Evo 3d, but I also like the software benefits of the Nexus S 4g. If tethering is something you may want and do not want to pay $30 a month or do not want to deal with rooting your phone, or if the latest software fromm Google is important, then the Nexus is for you. On the other hand, if raw power, 3d, and Sense UI is important to you, then Evo 3d is your phone. Either way, choice in this situation is good and that is why we choose Android over Apple.
On a side note, the Nexus 'Prime' will probably be the best combination of the two.