Find out how to trim your own micro-SIM card for use in phones that require this new format. Sharon Profis Former Vice President of Content, CNET Studios As vice president of CNET Studios, Sharon led ...

The SIM card, or subscriber identity module, has been a standard in GSM phones for many years. It's always been very easy to switch your mobile network account between GSM phones since all you had to ...

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 ...

The SIM cards that fit into those tiny slots in your cell phone and tell your cellular network to whom your calls are to be charged come in four different sizes. With the only real difference between ...

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; ...

The decision to use an unusually small SIM card in the iPad means current iPhone customers can't just use their iPhone's SIM in an iPad, as we reported last week. It appears increasingly likely that ...

T-Mobile is now offering a micro-SIM card for customers wanting to use unlocked iPhone 4 handsets on its network. This move shows that T-Mobile is not only embracing unlocked iPhone 4 users, but may ...