Messed up iPhone 5 activation?

Ok, so my friend got her iPhone 5, and we were setting it up, when we finished, the phone won't send messages and her old phone is still getting her calls and texts. We didn't turn the old phone OFF when we activated the new phone. So now the new one, doesn't have service and it doesn't get messages, make calls, etc. How do you re-activate it? Or can we COMPLETELY start the WHOLE thing over as if it was brand new out of the box, and we set up language, country, find my iPhone, again,?

Settings > general > Reset

You should have an option to reset all settings. That should reset it to factory default (fresh out of box).

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