It seems as if, you don't get trusted antivirus for the Android, expect trouble.

Most freeware security apps on the Android market prove to be useless, especially when well-known free security apps such as AVG fail to protect against mobile malware.

It is best to pay for premium antivirus solutions, instead of getting it for free. Security experts argue that premium antivirus solutions are ALWAYS better than free solutions, whether mobile or PC.

To get the best protection for your mobile device, it is best to get good premium deals.

Tests conducted by AV-Test.org (PDF): http://www.av-test.org/fileadmin/pdf/avtest_2011-11_free_android_virus_scanner_english.pdf