Tmobile sim in my iphone 4 isn't working?

Today i got a sim only contract through tmobile, i can use the internet (i don't have Wi-Fi so it's definitely the mobile internet) but i can't text or ring anyone, any ideas? The woman said it may take 24 hours but why is my internet working and not my texts/calls?

Added (1). When i try to ring someone it doesn't ring at all, it says it's calling for about 2 seconds and then beeps off and says call ended, it doesn't even ring. And when i try to text it comes up with a little red exclamation mark and says not delivered

Added (2). I just rang my new phone from my old phone and it said that calls weren't being connected

Is it like they won't ring or it rings and cuts off

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