Spammers also are turning from PCs to for sending pharmacy, penny stock and e-card spam emails. Microsoft reported this month seeing spam sent from Android devices spewing from Yahoo email servers. The infected devices were located in Ukraine, Russia, Chile, Argentina, Venezuela, Indonesia, Thailand, Philippines, Lebanon, Oman and Saudi Arabia.

The consequence of sending spam from a mobile device is a higher wireless bill for the owner. Thousands of spam messages flowing from a device means a big jump in data traffic, which can lead to additional charges when volume surpasses a person's data plan.

in CSOonline's Malware/Cybercrime section.