Android, iPhone and iPod Touch users are all highly engaged with applications and frequently download them to their devices, according to a new survey from AdMob.

However, Android has a much smaller base of devices and thus has more upside ahead.

AdMob, a company that tracks mobile Web and application usage, found that Android and iPhone users download nine to 10 apps a month and iPod Touch users download 18 a month. More than half of the Android and iPhone users spend more than 30 minutes a day using apps, according to the survey results released Thursday.

More: http://news.cnet.com/8301-1035_3-10319403-94.html