T-Mobile has announced that it’s going to seriously clamp down on any users using unauthorized methods to get around its tethering cap. Those caught using more data than they should be on the highest tier, unlimited Simple Choice plan will be warned to stop, before being moved down to the entry-level plan. This move is aimed specifically at smartphone users who deliberately break T-Mo’s terms and conditions using workarounds to conceal their tethering usage.

The magenta carrier published an updated FAQ page on its support site stating that some customers have been blowing way past the 7GB tethering limit on the highest Simple Choice plan, some using as much as 2TB (2000GB) of data on their mobile plan. Its biggest concern is the experience created for others. With people using the network so heavily, it can ruin the network performance for everyone else. The carrier has developed software to detect those using workarounds and will initially warn users. If they carry on abusing the network, then they get moved on to a plan with just 1GB data (including tethering).

We’re first warning these customers that they’re illegally using more data than they bought. We hope folks will stop on their own so they can keep their current plan. These customers are on an unlimited 4G LTE smartphone plan that includes a set amount of Smartphone Mobile HotSpot data, but they’re using workarounds to make their tethering look like smartphone usage which helps them use significantly more 4G LTE tethering than their plan includes.

Once they’re on a plan with a set amount of 4G LTE data, it won’t matter what method they use for Smartphone Mobile HotSpot. Once they use their 4G LTE data bucket, they’ll continue to be able to use data at reduced speeds and still never worry about overages.

T-Mobile will start communicating these changes with its customers from today and notes that only a very small percentage of its customers have been discovered to be concealing their tethering. Despite it being a very small fraction of the customer base, it has a “disproportionately negative impact” on the experience for everyone else.

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