Ah ... I'm re-reading your original post, I misunderstood your question.
I do not think that's possible.
I can go into my phone menu and look at my βphone numberβ, but I changed it since it now has a different number, but the phone still shows the old number. I think the source statement encoded it there. (Smartphone)
An SMS / voice call at some point is the only way I know. I am an SMS phone from my work phone when I need it.
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