IPhone 5 Problem - SIM not valid?

IPhone 5 Problem - SIM not valid?

Added (1). I bought an IPhone and it fell several times. The screen broke so I went to the ICentre and asked them to repair the screen. They told me that they can do that or they could change my IPhone for a new one but I needed a transfer of data. I asked them to do it because I'm not a huge expert in Apple devices.
I got a totally new phone a few days later but I had all the data that was on my old phone. Now that I put my SIM card back to its place, it says 'SIM Not Valid'. What should I do now?

You've been supplied with an iPhone locked to a different network to yours. Go back to the supplier and demand one which is either unlocked or locked to the network you use.

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