Apologies if this is the wrong section to ask this... So I'm trying to unlock a HTC desire. My old network 3 has emailed me an unlock code to do this. I put in an O2 SIM and the phone comes up with a screen prompting me to "enter PIN code". Now I've tried the unlock code in my email twice and it's not what it wants it seems. I've only got 1 go left so I didn't want to try entering it again. Does anyone know what the problem is here? Is it asking for the SIM cards serial number when it says "PIN CODE"? If so would that be my old 3 SIM, or the serial number of the 02 SIM? I never had a PIN on my phone when I was using it so I can't think what it wants really? cheers for any advice guys.