PDP authentication failure iPhone

[Koh]

Bought prepaid Vodafone for travel across SpAin, France and Italy. But it stopped working as soon as we reach Corsica, France. PDP Authentication Failure. We are both using iPhone 7 plus and iPhone 6  I am still in Corsica now. I cannot sync with iTunes as I am not with my laptop. 

[BandOfBrothers]

Hi,

There are quite a lot of different discussions cantered around the authentication error. 

They have a few different pieces of advice. If you can I'd suggest google to bring them up. 

In regards to iTunes you maybe able to download your  iTunes on another computer and authorise it to be used.