Verizon CFO Fran Shammo said on Tuesday that the carrier's unlimited data plans could come to an end in the summer. She mentioned during a that Verizon would "probably do that in the mid-summer time frame" and implied strongly that it would be timed for the expected summer launch of the iPhone 5. There could be some profit margin "lumpiness" in future quarters as Verizon took on the subsidies for a large number of iPhones, Shammo said.
