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 ...

iPhone 4S users are reporting SIM card issues with their handsets. A thread about the topic on the Apple support site has now accumulated more than 200 posts and 30,000 views, suggesting that the ...

In a first for US wireless carriers, Sprint and Verizon Wireless will allow iPhone 4S customers to unlock their mirco-SIM card slots, which enables use on wireless networks around the world, reports ...

What is a SIM card used for? A SIM card, or a subscriber identity module/subscriber identification module, is a tiny memory card that contains unique information and is linked to a particular network ...

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 ...

Contrary to initial reports, the Sprint version of the iPhone 4S will not come with an unlocked microSIM slot allowing customers to pop in international SIMs; it will be able to roam on international ...