As smart phones increasingly mimic your computer in their functions, it is important to keep them secure from hacking, loss, or theft. A good review on security products available for your mobile devices was recently published by AV-Comparatives:
http://www.av-comparatives.org/comparativesreviews/mobile-security

I have no comment to make on their testing or conclusions, since I neither need nor use such devices. But it is clear to me that those who do need protection, just as much as they do for their computers.