Mobile phones are becoming very competent and popular mobile gaming platforms. According to the largest third party application store, mobile games were 25% of all apps sold for the first half of 2009. That is a 6% increase from 2008.
According to Handango's report, Android was one of the most popular gaming platforms for mobile devices. Games in the Android catalog accounted for a larger percentage of sales than they did in other smartphone catalogs.
Android isn't alone in being a popular gaming platform. Handango also said that RIM's Blackberry line was popular with mobile gamers, 36% of all apps sold for the device were games. The growth of mobile gaming is no surprise to me. We always have our phones on us for the most part and games are a great way to kill some time.