The first sign of attack is a message that appears to come from a contact, offering you a file to download.

BBC: Hand on keyboard

Once you install Xsync on your iPhone, you select an audio file, photo, video, contact, or calendar appointment, each of which is represented by a simple icon.

WSJ: Easier File Sharing With Phones In Black and White

The IRS may contact you (usually about two and a half years after you file), asking you to extend the statute of limitations.

FORBES: Taxes Filed--But Is Your Return Safe From Audit?