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.
The International Direct Dialing prefix (IDD) is the prefix needed to make a call from a country to another country; in that sense, it is like a long distance dialing prefix that you put before the area code.n general, you will also have to provide the country code for the country you are calling, just as when making a long distance call you have to put in the area code after the long distance prefix.