Motorola drew 28 percent of revenue from Verizon in 2010

Motorola Mobility's bet on Android has brought the company back from what seemed to be an endless sea of red ink. The vanguard of Android in the U.S., however, has been Verizon, and what will happen to Motorola Mobility now that the Verizon iPhone has launched?

In a new report on Friday, Bloomberg reported the hard, cold numbers. In 2010, Motorola Mobility drew 28 percent of its revenue from Verizon in 2010. That number was up from 17 percent in 2009 and 13 percent in 2008, according to a regulatory filing. Meanwhile, Sprint accounted for 13 percent and 7 percent of Motorola Mobility's revenue in those two years.

It's clear from those statistics that both Sprint and Verizon are important to Motorola Mobility, and that the Verizon iPhone could severely impact its revenue.  New Android phones targeting AT&T as a carrier, such as the powerful Atrix 4G, are thus necessary to make up at least part of the difference.

Verizon began selling the iPhone on Feb. 10, ending AT&T’s exclusivity for the device in the U.S. However, recent reports indicated that the Verizon iPhone wasnot meeting sales expectations.

The true test of the Verizon iPhone will likely come with the iPhone 5 this summer. It's possible, if not likely, that some have held off as the iPhone 5 is only a few months away. It's expected that the iPhone 5 will be a dual-mode phone, capable of working on both AT&T and Verizon, and enabling those on the Verizon network to use the device on global GSM networks.