New customers can get a month of Unlimited Talk and Text and 5GB of 4G or 5G LTE Data for $1 at Boost Mobile. Normally, this plan costs $25 per month. You'll also be getting a GSM SIM Kit shipped to you for free, which saves you an additional $14.99. The SIM card will work with most GSM-unlocked phones. If you don't have an unlocked device, you can purchase a new phone at Boost Mobile to use with this plan. After your first month with the service, the plan price will return to $15 per month. Sales tax is charged in most states.