If your SIM works in your phone here then it should work when you are abroad.
It doesn't make sense to me that you were prompted for a SIM PIN if it's not the SIM PIN used to restrict access after rebooting the phone or something?
iPhones can be hassle in this respect but you don't seem to be using one?
When in the EU you will need cash credit to cover the costs of outgoing and incoming calls and outgoing texts.
See here for details:
Or else you can buy EU roaming add-ons:
Data roaming does not work abroad so you will be restricted to wifi where available.
Hope this helps.
Bear in mind that the previous query was from back in October 2014.
Is your solution the same as this?
Difficult to say because I don't understand why you would get such a message if your phone + 48 SIM work fine here and you use the same setup while roaming abroad. The message is either for the SIM PIN which should only appear if you enable SIM PIN locking in your security settings. In that case use the SIM PIN1 or this approach to getting in:
Otherwise the phone is saying that it's locked to a specific network and cannot be used on another network - and this should simply not be the case if the phone works on 48 because by definition you need an unlocked in the first place...
Do you have the exact message and a precise description of how/when it appeared?