Cannot log in - unable to authenticate old phone number

[Dangermouse4]

Hi

I have an old mobile Pay As You Go phone, the number of which authenticates all my accounts. PayPal requires me to authenticate my account, by recieving a text message before I can login. Apparently my old number no longer exists (thank you Vodafone) so, I cannot login to PayPal to change my mobile phone number. I have funds in my account so I would like to sort this out. Can anyone help, please. 

[Franco501]

Can't update my phone number