Starting June 12th T-Mobile will enable tethering or "mobile hotspot" on all of its postpaid, prepaid, Simple Choice, Simply Prepaid, business, government and all other plans that include data.
Simple Choice and Simply Prepaid customers will get to use all of their high speed 4G LTE data on tethering if they so choose. Once used up, data and thus mobile hotspot speeds will be reduced to roughly 128 kbps. Those on the $80 Unlimited data plan will see their mobile hotspot allowance increase from 5 GB of LTE to 7 GB of 4G LTE before throttling.
What's not known at this time is if streaming services that are part of the Music Freedom program will count against your mobile hotspot data cap.
It's nice to see that at least one carrier is now willing to allow you to use all of your high speed data up on mobile hotspot. It's kind of silly that this would be restricted at all by any carrier in the first place. It's your data and you should be able to do whatever you want with it. The only exception I could understand is for those on truly unlimited data plans as they could easily be abused when people start to use mobile hotspot in place of an ISP at home, something it wasn't designed for and that could strain the network.