Dostałem info od HTC odnośnie gwarancji:
If it is a UK device, it can be repaired either in the UK or at one of our global repair warranty centres such as Taiwan or UK but not in Poland as they only have the Polish ROM's.
a za chwile dostałem poprawkę:
Yes, the phone will still be covered by warranty. However, you would need to check the reatailers warranty as well.