The SIM card in your cellphone talks to the contactless near-field communication (NFC) chip through a cool protocol that we’d never hear of until reading his blog: single wire protocol (SWP).

[Jason Gin] wanted to reuse the SIM card that came with a ZTE WF721 wireless ... The only thing left to do was crack it open and sniff the PIN with a logic analyzer. This project is a fantastic ...

In the current version of Google Messages, dual-SIM users can easily switch between SIM cards using a prominent icon right there in the message composition area. The app also remembers the preferred ...