WhatsApp, iMessage give the most info to the FBI, new document shows - Android Authority
WhatsApp, iMessage, and Line all provide “limited” message content in response to a legal request from the FBI.But the amount of data shared by WhatsApp and iMessage doesn’t stop there, and it turns out that “limited” message content isn’t as innocuous as it sounds.Telegram doesn’t offer message content at all, nor does it typically provide contact information.
Signal doesn’t provide message content either, but does offer the date and time a user registered on the service and the last date it connected to the platform.