SIM cards have been an integral yet often forgotten part of owning a smartphone for the past few decades. For most users, the SIM card defines the basic commercial relationship they have with their ...

Depending on your mobile carrier, you might not have a choice, but there are plenty of good reasons why eSIMs are overtaking physical SIM cards.

Are you thinking of making the switch from a physical SIM to an eSIM? The good news is that you may be able to simply convert your SIM card to an eSIM from your device. We’ll walk you through the ...

As smartphones have become more pervasive in our lives, we've all kind of been forced to pick up basic knowledge and terminology over the years. Where previously certain jargon would exclusively be ...

Sareena was a senior editor for CNET covering the mobile beat, including device reviews. She is a seasoned multimedia journalist with more than a decade's worth of experience producing stories for ...

Once you’ve activated your iPhone with your carrier, it should continue to work on the cellular network without any problems as long as you’re within range of a tower. Nevertheless, the vagaries of ...

After obtaining a SIM card, consumers can activate the card and phone number through the mobile operator's application.

We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› By Ryan Whitwam Most people rarely think about SIM cards, the tiny plastic ...

Some owners of Apple's new iPhone 4S have been hit with SIM card error messages, even if they are connected to a CDMA carrier that does not use SIM cards. One reader ...