It's askin for a pin I don't have one
If you haven't set up a PIN previously, when you first call 443 you'll be asked to enter a PIN.
This means that if you ever need to access your voicemail from another handset then you'll be able to enter this PIN and your voicemail will be protected from other people accessing it.
Forgotten your voicemail PIN?
You can have it reset by texting the word RESET (case sensitive) to 802443. This won't work if you have your PIN protection switched ON.
Note: Resetting your PIN may not work if you are abroad, as some networks won't allow this operation. However, we recommend you to try it first or do this change while in UK.