T-Mobile suggests that this limit only impacts the "top 3% of data users", so most customers will never see "reduced speeds due to prioritization". This was initially reported as a leak but T-Mobile has since confirmed the change on their Twitter.
Just a few months after T-Mobile chose to increase the "Fair Usage" threshold for their customers to 32GB, a source has said they will once again increase this to 50GB.
To make matters worse, many of these plans have additional caveats. Verizon's doesn't list a top speed with its introductory Go Unlimited plan, but the carrier does reserve the right to slow you at any time, long before you've passed the prioritization point. That's double the limit Verizon and AT&T enforce on their customers, and all-around good news for anyone on T-Mobile One. Oh, there are still limits, of course, but Tmo isn't alone there. This is not to be confused with the soft cap T-Mobile has on legacy limited data plans.
Well, free Netflix subscriptions mean increased data consumption, so naturally, the Un-carrier has made a decision to increase its unlimited throttling limit to 50 GB. As of early this year, that limit was 32GB, but now that's increasing to 50GB. This is a fairly significant upgrade, and one that many users probably won't hit.
Ray is quick to point out that slower download speeds - as a result of prioritization - only come into effect if you 1) have consumed over 50GB of data in your current billing cycle and 2) you are now connected to a sector of its network that is experiencing heavy congestion. In the case of T-Mobile's new One plan, though, 50GB is practically unlimited for the vast majority of customers.
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