Good Day.
GTA encompasses a very large geographical area which includes 647/416/437. If it is local call within that exchanges local calling area, you can complete the call using only 10 digits. If it is a long distance call, the digit one must be added to the beginning for any calls placed to a North America phone number.
The local calling area for a specific exchange consists of that exchange area plus other exchange areas to which local calls can be made from the specific exchange without incurring long distance charges.
If it is a local call you need to dial 10 digits. If it is long distance, it must include the country code, 1 .This is added to the beginning of the 10 digit number identifying this as a North America long distance call.
You can not turn off the long distance prompt. You can eliminate the prompt by including "1" before the number you are calling if you know it is long distance & not a local call. You can also store known numbers, local & long distance in your home phone or mobile device directory.
If you are looking for a precise map that will draw the exact line for what is a local or long distance call for every location that may be called from and called to for across Canada only; would be a next to impossible task to come up with today.
Thank you for posting your question.
Take care.
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