Instant Messengers

The widely used messaging service Slack appears to be down. Here's the latest information.

The Signal encrypted-messaging service said it's now possible to change your phone number without deleting your message history or groups.

Facebook Messenger has made end-to-end-encrypted groups chats and calls available, and here's how to use them.

Would-be iPhone buyers with long WhatsApp histories will soon be able to transfer their old data, the latest WhatsApp beta software suggests.

Signal Private Messenger now supports up to 40 participants in an end-to-end-encrypted group video call, five times as many as WhatsApp can handle.

WhatsApp upgrades its disappearing message feature, letting users make it the default for all chats.

Coming next week, Split Payments will let Facebook Messenger users divide bills between friends while making it clear who has paid and who hasn’t.

WhatsApp now lets you encrypt your chat backups with a private key, Facebook said in a series of online postings. Here's how the process works.