The special $35 rate for 6 months of unlimited service requires you, as we mentioned, to buy an LTE powered phone from Boost. Some of the phones available for this plan include the Apple iPhone 5c ($449.99), Apple iPhone 5s ($549.99), and the Samsung Galaxy S III ($399.99, $269.99 for refurbished model). You can choose from many other different phones.
We should also point out that the unlimited data includes 2.5GB of high speed data each month. Go over that threshold and you are throttled. Video is streamed in 3G.
Buy an LTE powered phone from Boost Mobile, and get 6 months of unimited talk, text and data for $35 per month
source: BoostMobile via AndroidCentral