There are certainly viruses/malware out there for all mobile operating systems, especially Android, but it's more likely to be a more traditional mistake like following a link from a fake eBay email or something. If you're using the official eBay app for iOS, from the App Store, or Android, from the Play Store, (does WP8 or BB have one?) or visiting the real eBay site from your mobe then you should be fine.
As it has always been the vast majority of virus/malware require the user to run/install them. Even in the heady virus filled days of WinXP there were only a handful of worms that could get access to your box without any intervention from the user (remember the Blaster worm!).
Personally I think the main precaution every mobile user needs to use is to check the spelling of URLs they type in, especially if it's a bank or retailer where you will use bank/cc details.
And NEVER do banking/shopping over those free (unsecured) wifi points at Maccas or the airport etc.
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