If I dialed a wrong number, and I were the one to say sorry, what should I say?
If I dialed a wrong number, and I were the one to say sorry, what should I say? If the other side there found out I have the wrong number first, what usually do they say?

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I would say "sorry, I think I have the wrong number" and hang up.

The receiver would say something like "Ummm, I think you have the wrong number."  You could say "sorry about that" and hang up, or "sorry to bother you" (a little more polite).

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You: 'Sorry, I've dialled the wrong number' 
The other person: 'I think you have the wrong number. What number did you want?'

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"Oh sorry.  I got the wrong number"  or, "Oh sorry, I have the wrong number."   More and more the verb "to get" is replacing the verb "to have".  Welcome to American English!

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The other side might say "I think you have the wrong number." You might say, "Oh, I dialed the wrong number by mistake, sorry about that"