How do i contact canon tech support? Contacting Canon USA - by phone or otherwise. While 800-828-4040 is Canon USA's best toll-free number, there are 4 total ways to get in touch with them. The next best way to talk to their customer support team, according to other Canon USA customers, is by calling their 800-652-2666 phone number for their Technical Support department.What is the phone number for canon customer service? Canon Printer Technical Support Helpline. Get the instant technical support or help for canon printer with our canon printer technical support phone number 1-800-436-0509 available in USA, Canada, United Kingdom and Australia.What is the phone number for canon technical support? Canon Printer Customer Support Number (1-888-993-9077) Canon is a Japanese multinational company headquartered in Tokyo, Japan.