Hi all. I have HTC Aria in Europe. And when i insert my SIM card, it request some "SIM network unlock PIN"

So where i can find this PIN?

Try 0000 it is the default pin.

It's not SIM card PIN, it's SIM network unlock PIN for 8 symbols.

On desktop i see " NETWORK LOCKED"

The  network administrator who set up the network should have this pin.but I'm not sure were talking about the same thing.

I thought you meant SD card.your service provider will give   you this pin or it may be on the sim card itself.all the numbers are on the card the sim is attached to when you get it.

You can get sim network unlock pin at www.theunlockspot.com/.../rs16wp9  Here they will ask your country,network provider,mobile model no.After that they will send your unlock code with simple unlock instructions via e-mail.So you can unlock your mobile within a day.