To check if your Android phone is unlocked, try swapping in another SIM card or test your network settings. If calls work, ...

eSIMs are a digital replacement for the SIM card, but despite their advantages over physical SIMs, the technology can be difficult to use. While transferring a physical SIM card between phones is a ...

When you buy a new phone from AT&T Wireless, your eSIM or SIM card is set up and activated. However, when you switch to AT&T and bring your existing phone, you must activate your new SIM card before ...

Find out how to diagnose and fix bad cell service with these expert tips for getting more bars on your iPhone or Android.

For many years, mobile phones received cellular service through a physical SIM (subscriber identity module) card that connected your handset to your phone carrier. These physical SIM cards made it ...

SK Telecom (SKT) announced April 22 that “customer USIM data was leaked due to malware,” but the company did not disclose what and which sensitive information was leaked, or to whom the information ...

A dual-SIM setup lets you use one phone to make and receive calls and texts from two numbers. It's also super convenient and can save you serious cash when traveling. We show you how to use two SIMs ...