I was just in England and I bought a a factory unlocked iphone 4 from the Apple store in London.
I came back to the US and cut down my T-mobile Sim card to the Micro-sim size and installed it in the iphone. However, I get the following error message:
"No SIM card installed.
Insert a valid Sim with no PIN lock to activate iPhone."
I know that the sim card is working correctly because I put it back into my old iphone 3GS using an adapter and it works fine.
Does anyone have any thoughts on what could be wrong?
My sim card is over 4 years old. Could that be a problem?