Phone suddenly showing "No SIM" or "Invalid SIM"? Don't panic, there are a few quick checks that can get you reconnected fast.

Removing a SIM card from your phone can sometimes seem like a daunting task, but it is a relatively straightforward process that can be necessary for various reasons, such as switching carriers, ...

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 ...

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 ...

One of the benefits of having an unlocked iPhone is that you can switch out your SIM card when you travel. International phone plans are expensive, and it’s often much cheaper to buy a new card and a ...

When you use an iPhone for the first time – whether it's a new iPhone fresh out of the box or a used phone that you've gotten from another user – you need to activate it to set up cellular service.