Giffgaff

Voice Mail Settings

To ACTIVATE Voicemail - dial 1616

To DEACTIVATE Voicemail dial - 1626

To check voicemail's status dial *#004# [SEND]

To CHECK Voicemail - dial 443

To set your own Voicemail message dial 443 and follow the prompts.

Voicemail extend ring will set the number of rings before divert type in **61*443*10# and then the amount of seconds you want in increments of 5 secs maximum 30 followed by # then SEND

https://community.giffgaff.com/t5/Using-giffgaff/Your-voicemail/ta-p/3521085