Why does my iphone 5s keep on saying 'no service' i just got it about 20 mins ago?

My dad just bought me an iphone 5s about 15-20 minutes ago. I just got home and wanted to call my friend but it said 'No Service'.So I asked my sister and she said her iphone was able to call and text immediately after her purchase.
I would like to fix this problem by tonight if not tomorrow. I also tried the airplane mode method and it didn't work.

You have to activate it through your service provider. Usually the people in the shop do it, but perhaps there's a backlog and it may take a little while to go through.

I have same problem lol dude is your sim card in it? Is it activated? If yes then you are probebly down stairs where their is no service

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