Signal is free to use and there are no ads, no affiliate marketers, and no tracking in Signal. As Signal is an independent nonprofit, development is supported by grants and donations from people like you. You are welcome to contribute or donate and we appreciate your support.
To get started with Signal, you will need to receive an SMS or call to register within Signal. Signal then uses either a mobile data or WiFi connection to function. While Signal does not charge for these, this may incur costs from your carrier or mobile provider.