Turn your smartphone into a professional car diagnostic tool with a $15-30 OBD2 adapter and free apps that read engine codes in seconds.

With new phones, including the Apple iPhone and the T-Mobile G1, you can do more than call friends. You can find your way home or go bowling without picking up a ball. You can even scan bar codes at ...

You can scan a QR code using the camera on your smartphone, tablet, or computer — however, you may need to download an app.

Without a doubt, most modern phones are capable of scanning a QR code with their camera. It’s become a core function of the camera and for good reason. Samsung’s line of Galaxy devices is no different ...