T-Mobile will pay a fine and provide benefits to consumers totaling at least $48 million as part of a settlement resolving an investigation into whether the company adequately disclosed speed and data restrictions for its “unlimited” data plan subscribers.

A Federal Communications Commission’s investigation found that company policy allows it to slow down data speeds when T-Mobile or MetroPCS customers on so-called “unlimited” plans exceed a monthly data threshold. Company advertisements and other disclosures may have led unlimited data plan customers to expect that they were buying better and faster service than what they received.

The FCC’s 2010 Open Internet transparency rules require broadband Internet providers to give accurate and sufficient information to consumers about their Internet services so consumers can make informed choices.

“Consumers should not have to guess whether so-called ‘unlimited’ data plans contain key restrictions, like speed constraints, data caps, and other material limitations,” said FCC

Enforcement Bureau Chief Travis LeBlanc. “When broadband providers are accurate, honest and upfront in their ads and disclosures, consumers aren’t surprised and they get what they’ve paid for.  With the settlement, T-Mobile has stepped up to the plate to ensure that its customers have the full information they need to decide whether ‘unlimited’ data plans are right for them.”

The settlement includes $48 million in total financial commitments from T-Mobile. This includes a $7.5 million fine in addition to $35.5 million in consumer benefits offered to T-Mobile and Metro PCS customers with “unlimited” plans and at least $5 million in services and equipment to American schools to bridge the homework gap facing today’s students.

Eligible subscribers will be offered discounts on accessories and additional data.

The FCC received complaints from T-Mobile and MetroPCS customers who felt misled when they discovered their “unlimited” data plan included “de-prioritized” data speeds after using a fixed amount of data each month. Under its “Top 3 Percent Policy,” T-Mobile “deprioritizes” its “heavy” data users during times of network contention or congestion.

This potentially deprived these users of the advertised speeds of their data plan. According to consumers, this policy rendered data services “unusable” for many hours each day and substantially limited their access to data. The bureau believes that the company failed to adequately inform its “unlimited” data plan customers that their data would be slowed at times if they used more than 17 GB in a given month.

Under the settlement, T-Mobile will update its disclosures to clearly explain the “Top 3 Percent Policy,” who may be affected by it, what triggers its application and the impacts on data speeds.

T-Mobile will also be required to notify individual customers when their data usage approaches the threshold.

The company will also adopt the FCC’s “Consumer Broadband Label” to provide more information and clarity on service terms, including speed, reliability and cost, such as fees and other add-on charges.

Under the settlement, T-Mobile is required to update and improve its disclosures regarding its “unlimited” plans. It must either: provide clear and conspicuous disclosures about all restrictions on the amount and speed of data provided for “unlimited” data plans; cease the use of the term “unlimited” to label such plans; exclude “unlimited” data plan customers from the “Top 3 Percent Policy” or any similar practice; or limit any speed reductions for “unlimited” data plan customers to the minimum speed advertised for that plan.

In addition to the $7.5 million fine to be paid to the U.S. Treasury, the settlement requires TMobile to fund a $35.5 million consumer benefit program for T-Mobile and MetroPCS

“unlimited” mobile data customers.

The T-Mobile case is the FCC’s second action addressing disclosures for “unlimited” data plans that are subject to fixed data thresholds and speed reductions.

In June 2015, the Commission proposed a $100 million fine against AT&T Mobility for misleading its customers about “unlimited” mobile data plans.