In order to get your phone protected from virus attacks, you can follow the following steps. Open the attachments on the phone with the same amount of caution as you would do with your computer. This will include the attachments in the MMS messages and the emails. You should not open those attachments that have been sent to you by people you do not know. If you see any suspicious messages, you should not open such an attachment.
You should avoid links or text messages that look suspicious. Do not click on the links that look questionable. If you have to get apps downloaded, you should get them downloaded from stores that are legitimate. You should also practice using your memory card in a safe way. You should not share the card with another cell phone as virus can be spread by the infected memory cards. The Bluetooth has to be set in a setting that is undiscoverable.