You don't need a SIM card and cellular service to use most features of today's iPhones and Android phones. Most apps and services run just fine as long as you have access to WiFi, and you can even set ...

Can you use an iPhone without a SIM card? Yes, you can. But the tricky part is activating and setting up the phone in the first place. If you’d like your child to be able to use a spare phone without ...

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 ...

New iPhones come with a SIM ejector tool in the box, as long as it's included in the models available to your region (unless, of course, you have the new iPhones with eSIMs). It's a tiny metal object ...

One of the nifty things about Google’s Project Fi wireless network is that the company doesn’t charge anything extra for tethering, so if you want to use your Android smartphone as a mobile hotspot, ...

An eSIM can dramatically alter how you use your smartphone. Unlike removable subscriber identity module (SIM) cards, eSIMs are a permanent part of your phone and enable you to use two different ...

The digital version of the SIM card, included on many newer phones, is set to become prevalent. It also offers affordable cellular data abroad. By Brian X. Chen Brian X. Chen is The Times’s lead ...