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 ...

When you purchase an iPhone 4, your cellular provider will give you a new micro SIM card to use with your new iPhone. Although the cellular provider will automatically activate the SIM card for use on ...

Do you get the error message “No SIM Card Detected” or “No SIM Card Installed” after inserting a SIM card into your phone? This problem often occurs when you ...

You’ve just bought yourself an iPhone – welcome to the club! However, while you thought you’d just be able to pop your existing SIM card into your iPhone, you might be wrong. That’s dependant on not ...

You don't need to lose your old SIM contacts or photos when you upgrade to an iPhone, because Apple's iOS operating system and iTunes software allow you to transfer ...

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 ...