No Data - PDP authentication failure
Ive just started a contract with you guys about a week ago, the first few days were fine and I was getting 4G but since yesterday only 3G is appearing in the top corner of my iPhone 6S but even that's not working as every time I try to go online I get a message saying 'Could not activate mobile data network, PDP authentication failure'.
Ive done some research online and can see loads of people having this problem which worries me a lot about this new contract ive started...
I found this thread which seems very comprehensive and tried everything but it's still not working, some help would be amazing!!