Mobile malware was initially considered to be a hoax until it became obvious this malicious software existed and functioned. The earliest recorded mobile malware was called Cabir. It was released in 2004 and was designed to infect Symbian OS platforms via a Bluetooth connection. It was essentially harmless, but nonetheless proved to the public that worms could be found on mobile devices.
Since mobile devices usually contain private and valuable information, mobile malware has recently began moving toward having a specific purpose (usually exploiting information) as opposed to viruses created solely for bragging rights.