IPhone 5 won't let me phone people?

So I got a new iPhone 5 and it won't let me call people. It sent a text to my dad who has an iPhone 4 but it won't let me send a text to my mum who has an Samsung phone. When I try to phone somebody it comes up "Sorry, you've not been given access to the service" How can I fix this?

Your phone is in love with you and it's become possessive and wants you all to itself!

Contract your carrier or apple online support.

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