Why can't I send texts or make calls?

I have an iPhone 5 on Vodafone and I can't make texts or calls. What's the problem? I can receive calls and texts but not make them…
When I ring someone it says 'connection to this number is restricted to this phone' what does that mean?
And it's not just one person I'm trying it on its everyone in my contacts

First thing is that you should make sure that you have warranty
If you have it you can go to the nearest i store and they will solve your problems…

Call your carrier