Make sure you're downloading genuine apps and not imitations from app stores such as Google Play or GetJar. Signs to look for in trusted apps include a large number of good user reviews written in coherent English, a link to the app developer's website to see if the app is actively supported, and the number of users an app has.
Beyond apps, just as on a PC, never click on a Web link purporting to be from a bank or other financial institution, especially if that link comes to you via SMS.
Mobile devices may be the next frontier for malware creators, but as with PCs, the best defense is to use common sense and be on your guard for incoming scams via e-mail, social networks, and text messages.
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