PDP Authentication Failure

My partner and I both have an iPhone 5s on the Three network in the UK
Both phones are on iOS 8.03
We are currently in portugal and because Three do not currently allow minutes from the UK to be used in Portugal.
We both bought the europass data to use.
On landing both phones worked then 5 minutes after mine stopped and received Could Not Activate Data Network PDP Authentication Failure. My partners continued to work without any issues.
I've tried the numerous online fixes without success and also contacted my provider without a resolution.
We then tried my partners SIM card in my phone to check whether it was a sim or phone issue. Her sim failed in my phone and when she placed it back into her phone she then received the same PDP Authentication failure message.
It is therefore believed that it could be a software issue.
What are your thoughts Apple?
Thanks

This is almost ALWAYS a carrier problem. Settings aren't correct for your account, etc. However, there are a couple of things you can try, but if they don't work, you need to contact your carrier & have them check your account settings:
1. Remove the SIM card from your iPhone, then turn off your phone, wait are few seconds, turn your phone back on, then reinsert the sim card and wait a few seconds. See if this fixes the problem. If not:
2. Go to Settings -> General -> Reset -> Reset Network Settings on your phone to reset the network setting on the iPhone.

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