IPhone rings people while locked

Okay so ever since I updated to ios7 my iPhone 4 has been calling people, while it's locked! In my school bag it leave it locked and when I get it out at lunch, I'm on the phone to someone, the thing is it's ringing my cousins who live abroad, and it's costing me loads of money? It also rings random numbers ie never seen before, does ANYONE else have this problem? How do I stop it? And also please don't say turn it off in your bag because it's not just at school it's when it's just lying around te house. ANY Help IS APPREICIATED ALOT thank you!

Your phone could be on by itself, your phone is being "Touched", or it has a virus that automatically makes calls.

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