Not just locally on the device! There must be an error when calling or texting the number.
Data must work for internet for Signal, VoIP, etc.
This is for a UK PAYG SIM.
There should be no way for anyone to demand my number, or for me to leak it, or doing so should be irrelevant as it does not work.
Is this a statement, or a question?
So you are asking if this can be done? Some providers have data only Sims like what you get in a hotspot, or you could turn on do not disturb.