Palm said it has sold its two-millionth Centro smartphone, which is now available in more than 25 countries in North America, South America, Europe and Asia Pacific.

According to the Admob’s Mobile Metrics report, Palm Centro leapt onto the list of mobile phones worldwide in May as the No. 8 device, and moved up in June to No. 7. AdMob cites the growth of inexpensive phones, such as Palm Centro, as a primary driver in mobile Internet usage.

“Consumers are ready to do more on their mobile phone, and Centro has struck a chord around the world,” said Brodie Keast, senior vice president of marketing for Palm, Inc. “Centro has everything a person needs to stay connected with everyone who is important to them — and at a price point and size that make smartphones more attractive to a much wider audience.”

Palm has also added a Palm Centro in electric blue color for AT&T US early this month.