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

Free software on your phone or tablet lets you scan, create, edit, annotate and even sign digitized documents on the go.

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

"When the feature is enabled, and an image that may contain nudity is about to be sent or forwarded, it also provides a speed bump to remind users of the risks of sending nude ima ...