Does my contact need Signal? Masha Kolenkina Updated July 26, 2017 21:21 Follow Yes, both you and your contact need to use Signal if you want to communicate privately with messages and calls. Learn how to get started on Signal Android, get started on Signal iOS, or get started on Signal Desktop. Related articles Is it private? Can I trust it? Does it protect my messages from snooping? Does Signal send my number to my contacts? Get started with Signal Android How do I verify the person I'm chatting with is who they say they are?