@CaveBann
It's relating to your voicemail and is required to access your voicemail remotely.
You should be asked to set a PIN the first time you use the service.
Guide: All you need to know about O2 Voicemail 901
To change your PIN
Call 901 from your mobile
Press the * (star) key
You will hear the main menu options - select option 'four'
Follow the prompts to complete the change
Default PIN is 8705
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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