Hi there @jacquey
Are you dialling the correct voicemail access number for Giffgaff? When you join giffgaff, your voicemail is automatically switched on. You can access it by dialling 443. You can switch it off by dialling 1626 and reactivate it by dialling 1616.
To reset your voicemail PIN text RESET to 802443. You'll then receive a text with a temporary 5-digit PIN. Call the voicemail from your giffgaff phone to then enter a new PIN.
There's more information regarding Giffgaff's Voicemail feature for you via this link Learn more about voicemail features
While in the UK, EU and select countries:
You're charged differently for calls to voicemail depending on whether your calls come from airtime credit or from a goodybag allowance.
You have no goodybag or call allowance - 8p per call from airtime credit.
You have a goodybag with call allowance - Your goodybag minutes will reduce by 1 minute per call.
When you're in any other country:
When you're out of the UK, EU and select countries, instead of the UK per call rate (above), you will be charged according to the roaming rate of the country you are in for a call to voicemail.
For the latest tariffs check the Roaming charges page.