In this edition of Ask Maggie, CNET's Marguerite Reardon offers two travelers some insight on the best ways to save money on their wireless service while traveling abroad. It’s taken a while, but it’s ...

A dual-SIM setup lets you use one phone to make and receive calls and texts from two numbers. It's also super convenient and can save you serious cash when traveling. We show you how to use two SIMs ...

Most mobile phones rely on a small card called a SIM (subscriber identity module) to make phone calls and send text messages. Without it, your phone isn't able to connect with the cellular network and ...

Have you ever wondered exactly how a SIM card works? We’ll help you understand why your phone needs one and what they do to keep you connected. Image: TalkAndroid Editorial Note: Talk Android may ...