AT&T will raise the prices of its grandfathered unlimited data plans, according to DSLReports.

"Our Mobile Share Advantage plans and our AT&T Unlimited Plan provide several benefits that our legacy unlimited plan doesn’t," AT&T said in a statement to confirming the move.

"If you have a legacy unlimited data plan, you can keep it; however, beginning in March 2017, it will increase by $5 per month," AT&T said.

AT&T has revealed that starting in March 2017, it will begin charging $5 more per month for its grandfathered unlimited data plans. This means AT&T’s plan will cost $40 per month.

This is the second time AT&T has increased the price of its grandfathered unlimited data plans. AT&T first raised its prices for its unlimited data plans back in February 2016, increasing data plans from $30 to $35. AT&T’s data plan costs are in addition to voice and text plan costs, putting the minimum price on an unlimited data plan with text and voice of $90.

In the last few years, AT&T has increased the prices in attempt to get its grandfathered unlimited customers to switch to new plans. However, the FTC launched a federal court complaint against AT&T which led the company to scale the prices back.

AT&T reintroduced the $100 unlimited data plans but only limited them to users who subscribe to AT&T DirecTV or AT&T U-Verse plan.