> What? You must mean something else because unlocked devices aren't (necessarily) compromised.

I mean compromised in the sense that the malicious party now (for example) has access to the user's email, and would be able to reset a whole host of passwords for online services (assuming they don't use 2FA or something similar, which most users don't). If they wanted to install a keylogger, or get saved passwords, then yes they still have to jailbreak my device. This xkcd is relevant: https://xkcd.com/1200/

I think we must be using "unlocked" in different ways. I'm intending it in what I think is the conventional way for this context: when the device's cellular subsystem is not electronically locked to a particular cellular service provider.

You're absolutely right, I should've picked a different word. I mean unlocked in the lock-screen/password sense. Of course, messing with carrier settings is not easily done even if the phone is not carrier-locked, and pulling of an exploit that way is even more difficult.