For many years, mobile phones received cellular service through a physical SIM (subscriber identity module) card that connected your handset to your phone carrier. These physical SIM cards made it ...

The sim card that exists inside your phone is what connects your phone to your specific cellular network. For most of us we might not even realize it’s there. When we get a new phone from our carrier, ...

Just book your dream vacation overseas? The next step is to avoid costly roaming fees by getting an affordable international sim card for traveling. When traveling overseas, it’s critical to have a ...

After you purchase and use your cellphone for an extended period of time, you can change networks. However, the phone that you're currently using may not be offered on that network. If you wish to ...

For people who want to separate their work and home life, or who travel a lot to different countries, being able to swap between SIM cards in your smartphone makes a lot of sense. And while most ...

Most people manage perfectly well with a single SIM card, but some people like to have separation between their work and home life (or maybe they run several different businesses), or they travel a ...

If you’ve bought an iPad with 4G/cellular capabilities (we discuss whether that’s a good idea in our 2015 iPad buying guide) or a new iPhone, you need to buy and install a SIM card. Here, we explain ...