NEW iphone 5 says no service?

My new iphone 5 says no service. I just got it yeasterday. The person who was at the counter said that i had to turn it off and on every 30 min till it says Rogers (the company i got the phone at) but it doesn't say it. It still says no service. My sister got it at the same time, hers say rogers…
what is happening?

Is your sim card installed correctly?

Why are you asking us instead of Rogers?

Here is a crazy idea, call them and see so we don't have to buy a crystal ball.

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