Reading numbers in Japanese numeral-by-numeral instead of as a number


I was taught that generally numbers in Japanese should be read as:

[code]

    123 => ひゃく　にじゅう　さん
    
[/code]

However, I was wonder if there is any case where the numbers are read one-by-
one, like:

[code]

    123 => いち　に　さん
    
[/code]

I was thinking maybe for license plate numbers and room numbers, but I am not
sure which method would be appropriate. If both are used, is there a
connotation to using one pronunciation over the other?




The first case is generally used for numbers representing quantity or amount
like:

[code]

    price, age, weight, distance, time
    
[/code]

The second case is generally used for numbers representing identifier like:

[code]

    phone numbers, license plate, room numbers
    
[/code]

The difference between two cases is importance of number of digits, I think
so.

Rarely, the second case is used for informing any numbers that is **very**
important. For example, military affairs.




The first case is generally used for numbers representing quantity or amount
like:

[code]

    price, age, weight, distance, time
    
[/code]

The second case is generally used for numbers representing identifier like:

[code]

    phone numbers, license plate, room numbers
    
[/code]

The difference between two cases is importance of number of digits, I think
so.

Rarely, the second case is used for informing any numbers that is **very**
important. For example, military affairs.

