Is it necessary to dial a 1 before the area code and then the telephone number?

Does the 1 apply to all area codes??Is it necessary to dial a 1 before the area code and then the telephone number?
If you're dialing outside of your area code (or if the area you're in has an "overlay" area code) then you have to dial "1"+area code+telephone.
unless it's in the same area code as you, you have to dial 1Is it necessary to dial a 1 before the area code and then the telephone number?
not for local calls...



for example, NYC is covered by 718 212 646 347 917

because such a small area is covered by multiple area codes, it is mandatory that you dial the full 10 digit number, but when calling within the same area code, you do not need to dial the 1 before the number...



EX: calling 718-555-1212 from 718-555-1234 would not require dialing the 1 first, but dialing 212-555-1212 from 718-555-1234 would require the 1 first...



if you are not sure, you can always dial with out the 1, if you get an error message, then try dialing with the 1...Is it necessary to dial a 1 before the area code and then the telephone number?
yes..except if you are calling internationally you usually start of with a 3 digit country code like 012.