My iphone won't let me call or text

Okay so i just got an iphone 4s it was my dads old one (i got it when his contract ran out) Anyway as soon as i put my sim in its registering my sim is there and i have full signal and everything but it won't send any texts or let me call anyone but i can receive calls and texts, anyone got any idea what's wrong and how i can fix it?

What happened when you used someone else's phone to call your provider and ask them for help? I would just follow the advice of the customer service rep you have surely called by now.

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