Is there a problem with my iPhone 5?

I hope this isn't a stupid question!
Okay, so at about 11 o'clock this morning I went into carphone warehouse, bought an iPhone 5 and a sim only deal, all went lovely and smoothly in the shop, the guy said activating the sim could take 24 hours but is usually done within a couple of hours! Great! My issue is, my phone shows it has signal, does this mean its activated? I can't make or receive calls or texts and can't use the Internet. Is there a problem with the sim? Or does the signal not mean it is activated? I have no other phone or sim that will fit to test either phone or sim.
Has anyone else had this issue or can help?
I have turned it on and off a few times, plugged it into iTunes and taken the sim in and out, it all seems in the right place. When I make phone calls it comes up with an automated message, option 1 is for registering 10 or more phones, option 2 is sometime about registering call plans and then you can stay on the line to speak to someone. I'm assuming this is orange as that's who I'm with.
Any help would be brilliant!

Leave it for now, turned off with the sim in. Wait for the 24 hours to pass since you bought it, then turn it on. Try and use it. If it still doesn't work, take it back to the shop you bought it, or call your network provider and ask for advice.

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