I was directed here as I was having the same problems. I am back in Ireland after visiting 8 EU countries, I can report that data did not work in any of these countries no matter what I tried, and my settings were set to proximius.be and even when in Belgium data didn't work.
I went on line and did find the roaming solution for iPhones which worked someplaces.
I couldn't get network coverage in Sweden, Germany, England or Wales, I did connect in Denmark Holland and Belgium and France.
So over all very disappointed with 48 coverage in Europe.
Hi Kevin. Just back from prtugal today and unfortunately had absolutely no joy on data at anytime when away despite connecting to every network available with the exception of Vodafone which was listed as dis-allowed. Hopefully you can get these problems sorted soon.