Sprint to slow Boost Mobile's growth.

"Sprint Nextel has planned to slow the growth of Boost Mobile (a wholly owned subsidiary) because the MVNO is outpacing growth of the more lucrative post paid business and will soon start straining the iDEN network. While MVNOs have gotten a bad rap lately, Boost Mobile has been on a tear and counted for most of Sprint's subscriber additions in the most recent quarter. So far this year Boost accounts for about half of Sprint's 2 million new subscribers."