T-Mobile on Wednesday dropped the prices on its most popular family plans, in what it called a celebration of its results in OpenSignal’s recent State of Mobile Networks report.

For a limited time, customers can get four lines of Unlimited LTE for $150 per month. T-Mobile said families or small businesses can also add additional lines to the plan for $30 each, up to a total of 12 lines.

T-Mobile said customers who sign up for Unlimited LTE plan will get to keep their discounted rate for a minimum of two years.

The Un-Carrier is also offering families two lines with 10 GB each for $100 per month or four lines with 10 GB each for $120 per month.

T-Mobile said the offers are available to new and existing Simple Choice customers.

First launched in Dec. 2014, the Unlimited LTE plan originally offered unlimited talk, text and data on two lines for $100 per month. Additional lines up to 10 lines were originally available for $40 each.