How to stop my iPhone 4S from making calls while in my pocket?

Recently I have noticed that my iPhone makes phone calls while I'm working and haven't even looked at it for a few hours. That had never happened until a few weeks ago and I don't know of anything that I'm doing different. I always make sure I lock my phone before I put it in my pocket and I also have a pass code on it. I really don't know how I can prevent this from happening.

Do your pockets have holes in them that would let it touch your skin because thats the only possible way it could make calls, it can only sense a body part or finger and unless you leg knows the password i wouldn't think it could get it right maybe a 1 in a thousand chance. Your phone could be broken or someone could have accidentally called you

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