The first advertisements for Verizon Wireless’ long-awaited iPhone have appeared on YouTube.

Verizon posted a 30-second ad to its official YouTube website thanking its customers for waiting for the iPhone, with the tagline “It Begins” at the end of the spot.

Another ad, from Apple, was posted by a viewer who captured the ad when it appeared on television, but it has not yet been posted to Apple’s official YouTube website.

If the advertisement turns out to be official, it may indicate that Apple is playing up the strengths of having its hallmark smartphone operating with two U.S. operators instead of estranging itself from AT&T customers by showing Verizon-only commercials.

The spot is set to Johann Strauss’ “Blue Danube” waltz and features two iPhones being operated in sync, with AT&T’s and Verizon’s logos appearing before the tagline “two is better than one” at the end of the spot. The advertisement emphasizes that customers now have a choice between two carriers, instead of being locked in to AT&T.

The iPhone 4 will be available for pre-order to certain Verizon Wireless customers on Feb. 3 and will be generally available through Verizon a week later, on Feb. 10.

Apple ad spot: