To be pedantic, and thus clear: "iMessage" isn't an app. It's Apple's messaging protocol, that only works between Apple devices. "Messages" is the name of the

To be pedantic, and thus clear: "iMessage" isn't an app. It's Apple's messaging protocol, that only works between Apple devices. "Messages" is the name of the app, and it hosts both iMessage conversations and vanilla SMS conversations. Personally, I can't imagine being willing to use a proprietary messaging app owned by Facebook for any significant part of my online communication. Using Messages, my contacts aren't "in an app", they belong to my phone (and to my iCloud account, since I use that service). Any messaging app that I am willing to grant permission to has access to them. Also, iMessage conversations are end-to-end encrypted, and Apple has shown, repeatedly over the years, that they have no interest in mining them for saleable data.