Use encrypted voice communication
Encryption is a cryptographic concept of encoding messages or information, which ensures that only people who have a way to decrypt it will be able to read it.
Voice communications are very easy to monitor and intercept. However, there are applications that enable encrypted communication through voice calls, as well as text messages, including group communication, photography and video. One of these apps is Signal, which is open source , run by a non-profit organisation and is entirely funded by donations, which allows it to work without monetising the data of its users. Telegram is an application which also has an encrypted audio and video call option and is definitely among the most popular services for secure communication.Phone/Tablet Apps Encryption Computer/Laptop