Telegram is super easy, but there's the whole "not e2ee by default" thing that some people care about. Threema is liked for security. I haven't used it, but my

Telegram is super easy, but there's the whole "not e2ee by default" thing that some people care about. Threema is liked for security. I haven't used it, but my mother's tennis group is using it, and they're all 65+.