A SIM card, or subscriber identity module, is a small card in your cellphone that lets you place phone calls, send text messages, and more.

If you can't make a call or if you see an error message that your phone's SIM card is not working, there are several ways to ...

“Don’t use free public WiFi,” America’s Transportation Security Administration warns. It’s one of TSA’s "two best tips for ...

The BOOX P6 Pro is all set for its debut in China. The Android e-reader promises a color display, cellular connectivity, and Play Store access.

Jeff Carlson writes about mobile technology for CNET. He is also the author of dozens of how-to books covering a wide spectrum ranging from Apple devices and cameras to photo editing software and ...