Activate your iPhone back to AT&T if the SIM card you insert after you install blackra1n onto the device doesn't work properly. Blackra1n is a third-party program that "jailbreaks" SIM-bearing iPhones ...

A few years ago, the absence of dual SIM in iPhone was listed as a major shortcoming by numerous smartphone users. It’s normal for most smartphone owners to have a couple of SIM cards to keep their ...

You generally can't use an Apple iPhone on a cell network if it's never been activated with such a network, although once it is activated you can remove your SIM card or simply never connect to the ...

An embedded SIM is an industry-backed digital version of the physical SIM card needed to connect a mobile device to a network provider. The technology can currently be found in many flagship ...

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 ...

A SIM card, or subscriber identity module card, is essential component of any phone. It connects your device to a cellular network and stores vital information, including your phone number. Many ...

With smartphones advancing in features at a tremendous pace every year, manufacturers are in the pursuit to make components smaller and more efficient. One such change is in the SIM card technology ...