The Verizon iPhone 4 is getting closer. So close, that Verizon has posted a pre-order countdown clock on its Web site.

The clock is ticking down to 3:00 a.m. EST on Feb. 3, when existing Verizon customers can sign up for a "reserved quantity" of the device, which are likely to be delivered on the Feb. 10 launch date. To secure the phone, those that sign up will also have to sign a new contract with Verizon.

Customers on other carriers will have to wait until Feb. 10 to nab the iPhone on Verizon.

After months of rumors, Verizon announced that it had nabbed the iPhone 4 in a press event in New York. Previously, Apple's smart phone had been exclusively supported by AT&T.

Reports have said that with the iPhone 4, Verizon could take a bite out of AT&T's business. Approximately 26 percent of iPhone users currently on AT&T plan to switch to a Verizon iPhone, according to recent data from ChangeWave. Additionally, about 16 percent of AT&T subscribers have said they will purchase a Verizon iPhone.

ChangeWave also said that about 41 percent of all AT&T users will make the switch in the next three months, while another 31 percent will do so in the next year.

As far as other carriers go, about 15 percent of T-Mobile users will jump to Verizon for the iPhone and 10 percent of Sprint users will make the switch. Four percent of existing Verizon customers are expected to ditch their current handset for an iPhone.

However, AT&T said that it still has confidence in the iPhone.

"iPhone sales continue to be very strong in the fourth quarter, which gives us some confidence in terms of customer loyalty to the network," Randall Stephenson, AT&T's chairman and CEO, said in an earnings call.

AT&T activated 4.1 million new iPhones during the fourth quarter, down from 5.2 million iPhone activations in the previous quarter.

However, only time will tell what happens when Verizon kicks off iPhone pre-orders in less than a week.