that's why I use google to backup all my contacts
When I had Boost, it was up until 4 yrs ago. I'm not sure about now, but back then they has an iDEN network. The data was painfully slow, and that was in black and white lol
However, the voice quality was real good; as was coverage (in my area).
Of course, that may have changed.
For the price I paid, I really couldn't complain lol