Do you need to dial 1 when calling 1 800 numbers?

In North America (USA, Canada, etc.), you generally need to dial 1 before a toll-free number if you are calling from a landline, but not if you are calling on a mobile phone (cell phone). The toll-free codes in North America are 800, 888, 877, 866, 855, and 844, with 833 and 822 reserved for future toll-free use.