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A while ago I wrote this sentence:

Sorry to interrupt you, sir. But I think you called the wrong number.

Something felt wrong so I Googled: I think you've called the wrong number. To my surprise, That phrase has more hits on Google than I think you called the wrong number.

So my question is, which version is more common. And why?

Either one is ok. We know exactly when the person called the wrong number - it was when you heard the phone ring, right before you picked up. The present perfect tense ("you've called") is fine because you know this action was in the recent past, and the present perfect is commonly used for recent past actions. The simple past tense ("you called") is also fine because again, we know this action happened in the past (the recent past, but still the past). There is only one past event here, so you don't have to worry about using different tenses to make the order of past events clear, which is often a reason to use different tenses. For instance: "You called me yesterday, at which time I told you this was the wrong number, but you've called me ten more times since then!" - in this case, the present perfect indicates an ongoing action that might still be happening now.

EDIT: I will also say that I agree with David Siegel that "Sorry, wrong number" is a more common response when someone calls you accidentally.

Both are very common and perfectly acceptable. Since this is in fact used in informal speech, I doubt that google can tell us which is more common in practice. Strictly speaking, the calling is in the (very recent) past and is complete, so "You have called the wrong number." (shortened to "you've called") is proper. but the simple past "you called" is not wrong, and is one syllable shorter.

In practice, I suspect that just "Wrong number!" {click} or perhaps "Sorry, wrong number." is more common than either. (There was a famous radio play entitled Sorry, Wrong Number by the way. Quite thrilling.)

Neither.

I think you got the wrong number.

"Sorry, wrong number." is what I say when I called the wrong number.

Like the other answer says, Google isn't going to help you here, nor would downvotes on this answer (serving posterity), for its brevity or apparent (?) lack of proper grammar.