I don't know if your phone is a smartphone, or one set up specifically for Boost, as most of those are only designed to be used on the iDEN network (which is being shut down as I understand ).
Boost does NOT work with smartphones, as the architecture is not designed to support the feature set of smartphones, so I doubt you will be able to make your device work.
The iDEN class of phones has a strict usage, and every one I have owned and used has never been close to the features most smartphones include. Software and firmware are the two drivers behind this, as are the main processors and support logic, and then the RF system and subsystems.
All the talk I get from the two way radio market suggests that iDEN is on the way out....If not, they are certainly NOT a major player today, as they were just a few short years ago.
You can checkout current and past issues of Urgent Communications (Mobile Radio technology, or MRT) and find news about this as well as advertisements from Sprint and Kyocera (supplier).
Motorola was a huge supporter of iDEN, and was the main force behind the iDEN 'movement' when they were popular.
With the advent of the smartphone, Boost and Sprint have turned a blind eye to the iDEN network.
Boost is the prepaid service of Sprint, geared towards the younger crowd, with ads showing youths using Boost mobile as 'the' phone for their rather ridiculous 'where you at' commercials..
The i530 was geared towards contractors, for their rugged design and clamshell construction and that ever noticeable yellow case, then came the i570 with more 'refined' attributes and features....and the history of this 'show' continues.
The older i355 and so on continue to show up, but many can be purchased in bulk lots for pennies.