T-Mobile USA has launched a teaser site for its first HSPA+ mobile phone. While the company has been very aggressive at deploying its "3.5G" HSPA+ network, it only has USB data modems that take advantage of the speeds, which have a theoretical max of 21Mbps down. Some T-Mobile phones get higher speeds with HSPA+, but a specific chipset is needed to reach the 14.4Mbps promised on the teaser site.