How can I get a mobile number back if the SIM card been updated by a new number

[bristolian]

Can you explain what you mean by "the SIM card been updated by a new number"?

Are you saying that you've changed your number? If so, the old has gone and been replaced with the new.

[Chris_B]

@ichitamago  if a number has been replaced by a new one, you cannot get back the old number back.