Having a carrier-locked phone can make it difficult if you want to sell your phone or move carriers. Here are a few ways to ...

If your iPhone is unable to make calls or send text messages, it may be in SOS Only mode. Follow these few quick steps to ...

The feature is only available in the U.S., Australia and Canada. "When SOS appears in your iPhone status bar, it means a cellular network is available for emergency calls," the company says.

Seeing 'SOS' on your iPhone in an area with good coverage? Here's how to solve it.