Sprint's got a new holiday promotion aimed at switchers.

Starting tomorrow, December 14, Sprint is offering three free lines of service to new customers who sign up for an Unlimited Basic plan. Just join Sprint and sign up for five lines of Unlimited Basic service. You'll pay $60 per month for the first line, $40 per month for the second line, and lines three, four, and five will be free.

This pricing will be good through January 2020. After January 31, 2020, pricing will go up to $60 for the first line, $40 for the second line, and $20 for lines three through five. This pricing also requires autopay.

Sprint's Unlimited Basic plan includes unlimited talk, text, and data along with 500MB of LTE mobile hotspot usage (3G speeds after) and 480p video streaming. Customers also get unlimited talk, text, and 5GB of 4G LTE data in Canada and Mexico,  and free text and 2G data in more than 200 destinations around the globe. A Hulu Limited Commercials subscription is included as well.