New sim not working in iPhone 4s?

My boyfriend just upgraded his phone and gave me his iPhone 4s. He's on billpay and I'm on prepay (credit). I had to switch over networks from o2 to vodafone which was fine but now that I've put the sim card in, it just says no service (the sim isn't damaged)? The guy at the shop said it would take an hour for the sim to work but that was 3 hours ago.Am I meant to leave to sim in the phone for an hour and then it will work? It also will not connect to Wi-Fi. Any help would be great!

Check if you put it in the correct direction and try switching it off then on again hope it helps.

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