Is there a handy IM I can install on Android that doesn't need a unique phone number during setup?

I want to put an IM on the phone that my eldest sometimes is allowed to use, so they can leave me messages, I think they'd be amused by it. But the phone doesn't have its own SIM or number.

(We still very much have control over this phone - if messages are sent to or come from others, I will be able to see them etc.)

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