Why you need it? Are it important information?
It's critical for knowing how to keep the data.
This is called Data Modelling.
I suspect you need to keep a timestamp with each text.
So far, from what you said, I imagine using the phone number as the cloud DB tag and the list of texts for that phone number as its value.
Alternatively, maybe you are writing a chat app, which has been already been done on this board.
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