Sprint this morning posted a rare surprise gain in its core subscriber base after years of losses. Although its net subscriber base was down 69,000 in fall 2009 due to a large number of customers leaving the push-to-talk iDEN network, it actually gained 3,000 total subscribers to its CDMA phone service. The boost was the first in a year and a half and was helped both by some iDEN users switching to CDMA as well as added business, including the completed takeover of Virgin Mobile.
