Use messaging services that offer end-to-end encryption

End-to-end encryption helps you protect your messages and conversations from being monitored and reviewed by unauthorized parties. Apple’s iMessage chat provides end-to-end encryption between iMessage users, and there are a variety of third-party messaging apps that can exchange encrypted over-the-top (OTT) messages between users on the same app. Popular options include WhatsApp and Signal, and many messaging clients can also be used as your default app for less secure SMS messaging.