Its overlay area code is the 289 area code. It was introduced to the public in the middle of 2001. The first Mississauga (Malton) area code was all used up in the later months of 2005, thus the 289 area code will become the area code of phone numbers that will be given starting from that time onwards.
Direct inward dialing (DID), also called direct dial-in (DDI) in Europe and Oceania, is a telecommunication service offered by telephone companies to subscribers who operate a private branch exchange (PBX) system.
Dial LOCAL access number, or Toll-Free access number. At the prompt, enter your PIN number (sent via email) Dial your destination number (see below). Always dial destination numbers as if you were dialing from the United States. For Calls within or to USA, Canada or Caribbean: Dial the 1 + area code + phone number. Example: 1 + 312 + 555 + 1212. For International Calls: Dial 011 + country code + city code + phone number.