How to get my new micro sim to work?

I just got a brand new Iphone 5 as a present along with a Generic SIM card, I put it directly into my new phone, I was very cautios about doing so and did so correcty. But it says no service and I had service on my old I phone 4 with the same carrier how can this be fixed or what have I done wrong I haven't really got a clue as to what I'm doing to be honest. I have restored it, turned it on off taken it out and put it back in various times, even reset and backed up again.

Did you go into carrier settings, when it finally shows carriers e.g. O2 UK actually tapp it and let it register

Did this when I went from S2 to an galaxy s4, micro sim installed no service went on to settings welah

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