You may remember earlier this year when Straight Talk stopped stocking AT&T-compatible SIM cards and you were stuck with purchasing a T-Mobile SIM card. We had many different theories as to why AT&T ...

If you use a Wi-Fi + Cellular version of the iPad, your tablet may come with a SIM card slot tucked into the side. In the United States, the only major carriers that use SIM cards are GSM-type ...

Today we try to discuss what it means to have an unlocked phone and what to do if faced with a problem with it. This is far from a detailed explanation on the subject about why some unlocked phones ...

Have you been holding off on purchasing that shiny new Apple iPhone until someone figures out how to unlock it? While that day isn't exactly here yet, a major milestone has been achieved. By using a ...

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 ...

Apple's SIM cards let you easily switch wireless carriers, but AT&T is having none of that. I'm PCMag's managing editor for consumer electronics, overseeing an experienced team of analysts covering ...