If you can't make a call or if you see an error message that your phone's SIM card is not working, there are several ways to troubleshoot the problem.

You can activate a new or used iPhone for use with a cellular service provider in a few steps. Here's how to activate any iPhone, or troubleshoot it.

Most people that buy a modern Android phone expect it to work out of the box with minor tinkering. That's also true of various phone features, like reliable connectivity, performance, and storage. But ...

If you’ve upgraded your smartphone recently, you’ve probably seen the term eSIM pop up during setup. But what exactly is an eSIM, and how does it work? As mobile carriers and device makers move away ...

T-Mobile is offering a free line to some users. Here's how you can check your eligibility, plus some more tips and tricks before accepting.

Follow ZDNET: Add us as a preferred source on Google. As a person who covers consumer tech for a living, I get to use a few dozen smartphones every year. While I almost always advise on which is the ...

After three months of beta testing, Apple is finally releasing iOS 26 to iPhone users today. Going by past years' trends, the update should be available around 1 PM ET, along with the official ...

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