Boost is offering new deals on additional lines of mobile service this holiday season. For a second line, Boost is offering 50% off that second line for the first year. For those needing three lines, Boost is offering the third line for free. These deals assume everyone is on Boost's standard "Unlimited" plan, which is normally $25/month. The Unlimited plan includes 30 GB of "Premium" high-speed data per month. (Pricier plans include taxes, hotspot, international service, and more high-speed data.)


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