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by zarzavat 923 days ago
Actually not quite. iMessage is the protocol/service used by the Messages app to communicate between two iPhones. Conversely when you send a message between an iPhone and any other kind of device it uses SMS.

It’s possible that the GP is unfamiliar with iMessage because they don’t live in NA. I have neither sent nor received an iMessage for several years. I use the Messages app for receiving SMS OTP codes only and pretty much nothing else.