These two ways of connecting your phone to a cellular network are very different. We tell you about each and how you can switch from one to another.

However, some new research from Security Research Labs in Berlin reveals that some phones' SIM cards are suceptible to attack. Hackers can send a special type of SMS message (similar to a text ...

The ghost SIM card then plugs into your phone's SIM card slot and acts as an adaptor. In order to change between the SIM cards you have to turn the phone off and then on again.

Criminals don't need a physical SIM card to make the swap. In most cases, they call the mobile carrier and impersonate a victim. Here's how to protect yourself.

Donald Trump Jr. and Eric Trump have launched Trump Mobile, a new family venture featuring a 'bring your own phone' data plan. The SIM card and its services, which are part of 'The 47 Plan,' cost $47.

As many as 750 million mobile phones could be vulnerable to an encryption flaw on some types of SIM cards, a German cryptographer and researcher warned over the weekend.

Sure, apps, a media player, and a good-quality Web browser are great, but what I really want is a good dual-SIM card phone. And fortunately for me, the 2013 Mobile World Congress didn't disappoint.

If someone can convince your mobile carrier or a third-party phone store that they are you and that they have a new SIM card that they want to activate, they can essentially take over your smartphone.

We use so many things in our daily life, but never pay attention to their design. From the USB port to the buttons of your ...