I'm terribly sad I've had my unlocked HTC Hero (purchased from ebay) for 2 days now, and have been using it with my old Sim/WiFi. Today I went off and bought myself a 3 (Ireland) 3Pay Sim so I could start using the 3G features, but when I turn the phone on it says "Sim No Service" and when I manually select the 3 network it says "Your SIM card does not allow a connection to this network"! I have tried the new Sim in my old phone and it won't turn on: "Card error!". But it is not a 3G phone so perhaps that is to be expected? Or perhaps the Sim is just faulty? Anyone got any idea whats going on? I am reading some stuff about 3 blocking non-3 handsets, but every thread seems to have some posts saying "it worked for me" and 3 do say themselves that you can bring any unlocked phone to them by buying a 3 Sim. Call centre don't have any ideas so I thought I'd ask the real experts.