My Galaxy is unlocked and is normally using an Irish SIM card. I went to Denmark and inserted a Danish SIM card and set up an APN connection. This worked fine for about 5 hours where I was able to make and receive calls and surf the net. However, now it just says "No Service Available" and there's no signal. The Danish SIM card works fine in other mobile phones. I have had it out 4 times with no luck. The Irish SIM card works fine as there is a signal. Anyone got a suggestion to a possible solution? Many thanks!