If the phone is on O2 branded firmware, many of the speed dial positions will be locked out and reserved for network shortcode functions.
Some phones even allocate speed dial settings directly from the sim card.
There is nothing you can do except use a different phone.
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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