T-Mobile is wooing families ahead of vacation season with a new deal offering a four-line discount.

The promotion includes four lines with unlimited talk, text and data with 6GB of high speed data each for $30 per line. Additional lines with 6GB of data can be added for $20 each, T-Mobile said.

The deal brings the total cost for a family of four to $120 per month, which is $30 cheaper but includes less high-speed data than the $150, four-line Unlimited LTE plan the Un-carrier offered in February. The promotion also includes 4GB less data per line than another T-Mobile offering from February that included four lines with 10 GB of high-speed data each for $120.

This time around, however, T-Mobile is also offering customers a free Samsung Galaxy Grand Prime when they purchase a new Samsung Galaxy S7 or S7 edge. The cost of the device will be refunded via a prepaid card, the carrier said.