How to read japanese telephone number.

For example: 0797-38-5432.
Is it just read as rei-nana-kyu-nana san-hachi go-yon-san-ni?

I have a book called Minna no Nihongo I. In this book, the number is written like this:
0797 no(in kana) 38 no(in kana) 5432. What is the "no"for?

For example: 0797-38-5432.
Is it just read as rei-nana-kyu-nana san-hachi go-yon-san-ni?
I would normally read it as: "zero-.." the rest is the same.

I have a book called Minna no Nihongo I. In this book, the number is
written like this:
0797 no(in kana) 38 no(in kana) 5432. What is the "no"for?

This "no" is just connecting the different parts of the phone number. It's
like:

38's 5432 of (area code) 0979.

"No' is often used as a hyphen in phoner number, address number, and so on.

As mentioned you can also say "zero/ゼロ"

The "no" is this context is used as the hyphen/space/connection

zero no ichi would mean 0-1

use zero/ゼロ for 0.
don't use "rei" in phone numbers!

0 zero
7 nana
9 kyu
7 nana
- no
3 san
8 hachi
-
5 go
4 yon
3 san
2 ni

Why?

I always use 'rei' in phone numbers.

You can either use the "no" or simply pause instead as you would in English.

I thought "no" in this case is an "ai-no-te" in other words a sort of an interlude.

For example, when you take dance lessons, the instructor says, "Uh one, and two, and three, and four. Uh one, and ..." The "uh/and" is the "no" in this case.

In any case, as mentioned, "no" is read where the dash (-) comes. So it's not that you can say "no" in any part of the number. At least you must be accurate in separating the area code.

Btw, I say "rei" too. When I am asked, I tell my area code using the word "rei". And then the operator repeats it saying "zero" :)