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what/where do I get the voicemail pin - not accepting my normal pin code?
What do you mean by your "normal PIN code"?
If you mean your SIM PIN code then it's not that.
See here for how to use voicemail:
How do I use my Voicemail?
Hope this helps.
it's as simple as dialling 171 and putting in a pin code which on further dialling 171 is requested.
Do you mean that it IS accepting your PIN after all?
no only when it was reset
When what was reset?