Insert valid sim with no PIN lock?

I've just bought an iPhone 4.It's 3 months old and unlocked. However, when I switch it on, this message comes up "Insert valid SIM with no PIN lock"

I previously owned a Blackberry, and I cut my SIM into a MicroSIM after meticulously following intstructions online, to the letter. I haven't damaged the gold chip, it remains untouched. I've tried plugging it into iTunes, but as with on the phone, it lets me select the language, country and Wi-Fi network, then it comes up with this message "We're unable to continue with your activation at this time. Please try again later, or contact customer care."

I'm really confused, what am I supposed to do?

Sounds like the phone is locked

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