Palm just announced the sale of its two-millionth Centro a few days ago, showing a real rise in popularity. This may be due to the fact that the Centro is available in over 25 countries and is supported on 20 different carriers, though in the US, it is available on Sprint, AT&T and Verizon Wireless.

Lower cost may be boosting sales as well, with the Centro selling for $99 these days, which is, comparatively, a good deal.  

According to AdMob, the Palm Centro is among the top ten mobile devices in the world.

[Image via Palm InfoCenter]