Boost Mobile USA is offering a Buy 3 Lines & Get $40 Off deal at the top of the page, best for anyone who is activating three lines at once and wants an immediate, fixed saving on the service charge. The $40 off on three lines is the lead deal; if you only need two lines the Buy 2 Lines & Get $20 Off is the relevant fixed saving, and for single line buyers the $15 Off Unlimited Plan targets the monthly plan price.
If you need three new lines right now: the Buy 3 Lines & Get $40 Off applies. It gives a straightforward $40 reduction when you purchase three lines on the website. This is the only offer that requires three lines, so on three plans priced at $50 each, for example, you take $40 off the combined charge at purchase, which is larger than using the two line or single line deals because those require fewer lines.
If you need two new lines: use the Buy 2 Lines & Get $20 Off. It requires purchase of two lines and takes $20 off the order. If your two chosen plans are the $40 Global Connection plans, the $20 off is the correct match because the three line $40 offer is not available unless you add a third line.
If you are buying or keeping a single unlimited plan: the $15 Off Unlimited Plan is the offer to use. It reduces the unlimited plan price by $15. For example, if you choose the Unlimited+ plan listed at $50/month, the $15 reduction lowers that plan charge to $35 for the billing period the offer applies to, making this the best single line saving compared with the multi line fixed discounts, which require additional lines.
If you are comparing fixed price plans instead of one time discounts: the listed plan prices ($40 Global Connection, $50 Unlimited+, $60 Unlimited Premium) are the recurring monthly prices. Pick the plan price that fits your needs and then apply the matching offer above. For example, the $15 off applies to unlimited plans, so it can reduce a $60 Unlimited Premium to $45 for the period covered by the offer.
Use the specific line count offer that matches what you are buying: the $40 off requires three lines, the $20 off requires two lines, and the $15 off is for unlimited plans. None of the offer terms mention combining these deals, so assume they apply separately by eligibility. Take the single option that lowers your total the most for the lines and plans you are buying.
Our records show 7 offers for Boost Mobile USA in the 12 months to October 2026 and the biggest percentage deal in that window was up to 80% off in November 2025. There are no first hand checks recorded by our team for Boost Mobile USA in the 12 months to October 2026, so use the published terms on Boost Mobile USA’s website at checkout to confirm which discount applies.