So you’ve chosen Ultra Mobile as your carrier. Great choice! But before you start enjoying those international calling features or high-speed data, you need to install your SIM card. Don’t worry; ...

Activating a T-Mobile SIM card is a straightforward process that allows you to connect your device to T-Mobile's network and enjoy their services. Whether you're a new T-Mobile customer or upgrading ...

While most people seem to manage just fine with a single SIM card in their smartphone, some -- especially travelers, who can save money by fitting a local SIM card into their handset -- love the ...

If you are switching to a different LG phone or you just want to make a backup copy of the contacts in your phone book, saving your data to the phone's SIM card is the most convenient way to ...

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. I started my career with CNET all the way back in ...