I have just brought a iPhone 5c. I'm using my old SIM card with it?

When I try to activate it, it says error, could not activate iPhone.
When I try to activate it via Itunes, it says that my phone is PIN locked and that I have to unlock it first.
Any ideas on how to activate it?

Is your iPhone from the same carrier as your SIM card?
If you iPhone is locked to AT&T (example), then that means that you have to use an AT&T SIM card.
If it's unlocked, then you can use pretty much any SIM card as long as it isn't physically damaged.

Also, does the SIM have a PIN lock? If it does, you may need to remove it or buy a new one.

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