@SomersetSteve
Try dialling ##002#. This is the short code to cancel all diverts, including Voicemail 901 so you'll need to reactivate voicemail again if you want it on.
Guide: All you need to know about O2 Voicemail 901
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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