Most smartphones have a tiny hole at the bottom of them but it's not always clear what it's for. Here's what that hole is for and what it does.

No one likes dropping offline, especially if you need to stay in contact. Get expert tips for boosting your cellphone signal on iPhone or Android.

With high-end smartphones, the once-ubiquitous microSD card slot has all but gone extinct - here's why this storage expansion option has disappeared.

SIM swap attacks are rising fast. Learn how criminals exploit SMS codes and how to protect your phone, banking, and email from number takeovers.

Changing physical SIM cards on your phone is always a fiddly business. First, you have to root for the little SIM tray tool that Apple includes in the box with its new iPhones – except those in the US ...