With Sprint getting ready to shut down its iDEN network as early as June 30th, 2013, the carrier has apparently pulled its entire stock of iDEN devices to ensure that customers don't inadvertently pick up a phone with no future — a move that also affects pre-paid phone retailer Boost Mobile. As an alternative, Sprint's CDMA-based Direct Connect system is available should any of the 6 million iDEN subscribers wish to continue using push-to-talk devices after next summer. As Sprint's iDEN network approaches an end, spectrum will be freed up to help expand the carrier's LTE network.