Wi-Fi can easily serve as a backup for your cellular network for calling and texting, especially if you find yourself without signal. Mike Sorrentino is a Senior Editor for Mobile, covering phones, ...

If you want to fix the SOS displaying on your phone, here's what to do. But the issue may lie with your carrier.

* Internet phone service allows people to make telephone calls over a high-speed Internet connection instead of a regular phone line. Such services come in many different flavors. * Some, such as ...