T-Mobile is forcing users on its older unlimited plans to move to some of its latest options.

It wasn’t immediately clear how many people will be impacted or what a “small number” meant.

News of the plan changes first leaked onReddit,The Mobile Reportand on theTech Life Channel on YouTube.

Business users on Simple Choice Business will similarly be switched over to the carrier’s Business Unlimited Advanced.

The forced changes to legacy plans come more than three years after T-Mobilecompleted its merger with Sprint.

People looking to take advantage of that offer need to give the carrier notice “within 60 days.”