Should we be concerned with virus / malware infections on smartphones / tablets , no.
Most discussion on this emanates from the antivirus companies who warn us that without protection we may get infected and should buy download some sort of protection.
This can be directly related to the decline in PC sales and the rise in sales of tablets and smartphones and the decline in antivirus sales due to Microsoft doing a better job keeping things patched and introducing the best free solution Microsoft Security Essentials.
Currently you have little reason to be concerned , Apple devices there is little to no chance due to apps being vetted before going into the apps store . Android again little chance if you get your apps from the Google play store.
If you have "rooted" or "jailbroken " your device then you have increased your chances as you would be downloading from outside approved sources.
You can however have your information shared with the app makers and give them access to your device when installing especially Android apps. Read the information when installing.
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