In China people usually say "wei" (hello) first when beginning a telephone conversation. If you call an old acquaintance and recognize his/her voice, you may address him/her directly by name. Otherwise, you have to make clear who the other person is by saying, "Hello! Excuse me. Are you so-and-so?" or "Hello! Are you so-and-so?" instead of saying "I an so-and-so" first. "So-and-so" may be name of a person or a company.
e.g.
--Wèi, shì lǐ míng ma?
   (Hello! Are you Li Ming?)
--Duì, shì wǒ. Nǐ shì Qí Qí ma?
   (Yes, I am Li Ming. You are Qi Qi, aren't you?)
One usually says, "You dialed the wrong number" when receiving a wrong call.
e.g.
--Wèi, shì lǐ míng ma?
   (Hello! Are you Li Ming?)
--Bú shì, nǐ dǎ cuò le.
   (No, you dialed the wrong number.)
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