Telephone numbers

• dialling codes/ (US and Aus) area codes

  00 international code

  44 country code

  181 area code

  837 9292 number

  Ext.345 extension (number)

• The numbers are usually pronounced separately 
• 90233 is said "nine o two double three"
• Someone in an office has an extension number which is used by people within the office. Callers from outside must first telephone the switchboard of the company to be connected

• I'm on 309 2194 (that's my telephone number)
• If you can't reach/get me at home, try my work number. I'm on extension 433
• If you don't know the number look it up in the phone book/telephone directory, or dial (UK) directory enquiries/(US) directory assistance and ask the operator.