The Phone Number of the Syndicate's Boss

http://www.youtube.com/watch?v=XOgRevdiLnU

Conan is on a case and the criminal makes a phone call. This for some reason reminds him of when vermouth sent the message to her boss. Then detective Yamamura makes a call to his grand mother in Tottori. Both the call the criminal made and Yamamura made are to places in Tottori with the same area code "0858". When those numbers are dialed it sounds the same as when Vermouth entered her boss' address. So, "0858" is the first four digits of the black organization's boss' phone number.

After a case dealing with a man the has perfect pitch Conan finds out that the tone of those numbers "0858" being dialed is the same as "Nanatsu no ko" or "Seven Children" a Japanese children's song. This is so that the members of the black organization can remember the number without ever writing it down or saving it in their phone.

So after analyzing the tones that the keys will produce, Conan is able to come up with a more accurate number "#969#6261" That's the number Conan says belongs to the boss of the syndicate.