AOL’s Platform-A today announced that it will launch, in partnership with T-Mobile USA, an unprecedented billion-impression Web advertising campaign across Platform-A during a two-day period on November 10 – 11. The first-of-its-kind advertising buy underscores Platform-A’s ability to reach more U.S. online consumers – more than 90% — than any other online advertising business. Platform-A includes AOL’s owned-and-operated sites, along with the thousands of sites in the Advertising.com third-party network.

Platform-A and T-Mobile collaborated to create the “T-Mobile Billion Block,” the most-expansive two-day ad buy in Platform-A history and will spotlight the T-Mobile G1 with Google, the first Android-powered mobile phone.

Over a two-day period, the T-Mobile G1 will dominate a significant amount of AOL and other Platform-A inventory, and it’s estimated that approximately 81.5 million consumers will be exposed to the exciting new phone over the campaign’s 48-hour run.