There's a good chance today that you have users who are connecting their personally owned smart phones to your business network, and it's likely that some of those are running the popular Android operating system. Even though the malware risk for phones and other mobile devices isn't yet nearly as high as for PCs, as these devices proliferate, the bad guys will be targeting them more often. Smart IT departments will get ahead of the game by developing policies that require security software be installed on the phones that connect to their networks. There are a number of different mobile security suites out there for the various platforms. One for Android based devices that has received rave reviews and high ratings from users and testers is Lookout Mobile Security.
You can read the CNET editors' review and see screenshots, here: