O2 don't write phone numbers to their sim cards.
You need a phone that allows editing of the sim number, ie iPhone, Blackberry or maybe yours does as I'm not familiar with that make, but either way, you need to write your number to the sim card.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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