If you use 50GB of data in a single month, your data usage will be deprioritized behind other users. That's a sizable increase to T-Mobile's Fair Usage Threshold that was already the highest in the business when compared to Verizon or AT&T. Back in March, T-Mobile jumped the limit to 30GB before increasing it to 32GB in May.
T-Mobile is likely doing this to get people to switch from legacy plans over to T-Mobile ONE, not to mention to entice people to switch to the magenta side.
Although it's started as a rumor based on a screenshot of a T-Mobile document, the increase of the monthly unlimited throttling limit has been recently confirmed by the carrier.
Carriers are often quick to point out that these aren't hard limits, and customers aren't immediately throttled the second they move past the threshold.
Verizon and AT&T throttle users after 22GB; the move is meant to ensure that a small number of data hogs don't bog down the network.
To lose these restrictions, Verizon, AT&T, and T-Mobile offer more premium unlimited tiers - though, of course, you'll have to fork over extra cash.
As T-Mobile points out, the vast majority of users won't actually manage to burn through all 50GB of data in a month. For AT&T and Verizon Wireless, that limit is set at 22GB.
It's good to see that T-Mobile is continuing to be a disruptive force in the USA telecommunications industry.