Mobile phones have become commonplace and basic communications tools—now used not only for phone calls, but also for accessing the Internet, sending text messages, and documenting the world.

In all modern mobile networks, the cellular provider can calculate where a particular subscriber's phone is located whenever the phone is powered on and registered with the network. The ability to do ...

Your phone is filled with all sorts of antennas and sensors that collect a wealth of information. Here’s a rundown of some of them. The Global Positioning System (GPS) lets devices anywhere in the ...

This page was translated from English. The English version may be more up-to-date. This is an overview of network censorship, but it is not comprehensive. There are different ways of beating internet ...

Instant messaging systems are often unencrypted. Off-the-Record Messaging (OTR) is a way of adding encryption to them, so that you can keep using familiar networks like Facebook chat or Google Chat or ...

Below are step-by-step tutorials to help you install and use handy privacy and security tools. Surveillance Self-Defense encourages you to think about online privacy and security in a sophisticated ...

A small, removable chip that can be inserted into a mobile device in order to provide service with a particular mobile phone carrier. SIM (subscriber identity module) cards can also store phone ...

This page was translated from English. The English version may be more up-to-date. We've updated this guide to a new page. Please see the new version here. Signal is ...

It wasn’t long ago that spying was a labor-intensive job, requiring excessive resources and specific targets. These days, it has gotten much easier for governments or adversaries to spy on individuals ...

This page was translated from English. The English version may be more up-to-date. As with most chat apps, communications can be made between either individuals or a group, allowing you to send end-to ...

Supongamos que crees que te estás comunicando con tu amigo Bahram, vía mensaje instantánea cifrado . Para verificar si es realmente él, le preguntas en que ciudad ustedes se conocieron. "Estambul" ...

IMAP is the way that many email programs communicate with services that send, receive, and store your email. By changing the IMAP settings on your email program, you can choose to load email from ...