Why can't I activate my iPhone 5s?

My family surprised me with it, and I was given this card thing that had a code and a card to put in the phone. I put the card in, like it said to. My brother took control from there, and I can't send text messages. He handed me the phone back to connect my Apple ID… So I did the rest of the process, but it still won't work. Since it's xmas eve, the store is closed and I can't call in. I wasn't given a manual either… So I'm not sure what to do. I shut off my previous phone also… But that one still works. Not sure why.

Can anyone figure it out?

It sucks

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