Messed up activating iPhone 5?

I was supposed to use the new SIM card numbers but i used the numbers from my old SIM card and it won't let me inactivate the phone to try it over. Any ideas on how to fix it because my phone has no service until i can get it fixed.thanks

Added (1). When you are changing from the iPhone 4 to the iPhone 5, you have to register your phone on the service companies website. I needed to take the numbers from the sim card in my iPhone 5 and use those to register it but i accidentally used the sim card numbers from my iPhone 4. The iPhone 5's sim card is smaller so you can't replace them

What do you mean SIM card numbers? All you have to do is just insert the sim card and go on with your activation. All i can say is go to a computer, get itunes (if you don't), plug in your phone, and click on restore. That will restore your phone to the factory settings. Put in your new sim card, and proceed.

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