Writing Telephone Numbers: There are different forms in writing telephone numbers down in different countries. In the US, at least where I live, it is (213) 746 - 1776. Area code, prefix code and the actual phone number. Then there is a new style of using periods as in 213.746.1776.

HI... The most important thing, If you have to write a telephone number you need to write with figure (digit number) not in letters... !

Thank you for your advice. Actually I wanted to know wether I can use hyphen if I write down the numbers in English like 1...one, 2...two I use hyphen when I write telephone number with Arabic numbers. ex) 1234-5678 But if I spell out those numbers, I wonder if I can use hyphen. like one-two-three-four... Sorry for the confusion.

It depends where you live. In Australia the area code is in brackets ( ) followed by the numbers, unless it's a mobile number. I am sure that you can use a hyphen.

In the UK we don't use hyphens or commas just spaces. 0044 161 3853201 (or from inside the UK 0161 3853201). First the country code, then the area code and then the actual residential or business number.