My dad bought a S4 last year in the UK. It is the EU model and Unlocked for EU use.
When he got back to China it worked until the KitKat update then it became region locked.
We have tried several 5 - 10 minute calls on several sim's in the EU and China and it will not unlock the region lock.
I have looked around and people have suggested going into service mode by punching in a bunch of numbers, doesn't work.
Also looked at region lock away, I wan't to avoid rooting for the time being.
It was manufactured after July and is therefore region locked.
Has anyone solved this issue?