A SIM (Subscriber Identity Module) is a tiny bit of circuitry that uniquely identifies your cellular modem in a phone, tablet, or other device to nearby cellular networks to allow access for voice, data, and texting, and manage billing, whether on your home network or a roaming one. We’ve used SIM cards for decades, even as they have shrunk from full size to micro to nano. The introduction of eSIM eliminates an external card entirely: a reprogrammable SIM circuit (or more than one) is stored within a device with a cellular modem, letting you set up or change service with a downloadable file, via a profile, or by scanning a QR Code. Some people are confused about managing two eSIMs at once… Read More
How to back up your Mac before installing macOS Golden Gate
Your Mac is waggling an upgrade to macOS Tahoe in front of your face. Should you click Upgrade? Maybe. But should you...





