Without a doubt, Apple's iPhone devices are always an in demand model in the market. Even if they are a few years old, they still make a great purchase for anyone looking to upgrade their device. For many, however, switching to an iPhone device can be a costly move. This is particularly true for those who are buying a newly released flagship iPhone. Thankfully, Boost Mobile is currently selling pre-owned iPhone 6s 16GB devices at a price of $20 in select stores. That's a savings of $280 on the price of the pre-owned model. If you are interested in this deal, here is more information about this offer: The promotion was shared on HowardForumsand on Dragonicwarfare's YouTube channel. And as explained on the terms and conditions of the offer, you will need to port-in a number to a new line of service on Boost Mobile (ports from Sprint or Sprint-running MVNOs are not eligible). You need to activate service under the Sprint prepaid brand's $50 or $60 plan. You will also need to pay an activation fee and at least $50 for your first month of service. The iPhone 6s offered in this deal is a pre-owned device. Despite this, you still get the same features available on a brand new iPhone 6s. This means you are getting a device with a 4.7-inch IPS LCD display with a resolution of 750x1334 pixels and 326 ppi density. From within, the phone operates on a 1.84GHz Dual-Core Apple A9 APL0898 processor with 2GB of RAM and PowerVR GT7600 graphics processor. The built-in memory available in this particular model is 16GB. The phone also comes with a 12-megapixel rear-facing camera with dual LED flash and an f/2.2 aperture. In front, there is a secondary camera with a 5-megapixel sensor. The back camera can record 4K video. Battery-wise, the phone has a built-in 1715mAh battery that lasts up to 10 days in standby and 14 hours of talk time. The phone comes with 3D Touch control and runs iOS 9 upon release. Since it is a pre-owned device, you get a 90-day warranty coverage from Boost Mobile so you can return the device if it is defective. In exchange, you can get another device or have it fixed. The offer runs from June 5 to June 30, 2018. It is only available from participating dealers in select markets, not from boostmobile.com or national retailers like Best Buy. Only one device is available per line. The discount is applied towards the phone purchase, excluding taxes.