As much as 16.8 percent of all Verizon subscribers are "very likely" to switch to an iPhone if it becomes available on the network, Morgan Stanley analyst Katy Huberty found in a study today. She discovered there was "pent up" demand for the phone at the network and that there was more of a call for Apple at Verizon than either AT&T or anywhere else. Just 14.6 percent of AT&T subscribers share the same interest, while 7.5 percent of US cellular customers echo the feeling.