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.
International dialing codes. First explanations how to use the codes, together with the IDD, the international direct dialing prefix. Note: a typical mistake is adding a interstate long distance code to the number. See the first example. Normally, a 0 after the country code should be omitted. 011 49 089 123 4567 NOT. 011 49 89 123 4567 YES.