A story on paper:60

[The Abacus]

"top to bottom, telephone"

Try playing the game telephone vertically. XD

Hmm, all we have in the room is a string of colours, a tag that says "top to bottom, telephone", and a number pad.

a string of colours

string

Wait, what!

STRING and "top to bottom TELEPHONE"

Try: 7 2 25 18 16 2

[The Kakama]

Try: 7 2 25 18 16 2

Nice try, but no, it doesn't work.
(make use of ALL the clues, you didn't make use of the "colours" part.
There was a reason the tag says top to bottom/telephone, and it's written in 60's language)

[Vortex]

And if the colors mark a certain ordering? Maybe you have to match the numbers matching the colors and order them following the rainbow spectrum: red, orange, yellow, green, blue, violet

[borys610]

try 88761029

[The Kakama]

You're getting very close, but the ORDER of the colours is also important.
@borys: It doesn't work.

[The Abacus]

try 88761029

Out of curiousity: how did you come up with that?

[borys610]

End of mine YT login, day and month of my birth and my number in class list.

[The Abacus]

So it was completely random?

[borys610]

No it was my ultimate number, that I use everywhere.
Why do you ask?

[The Abacus]

out of curiousity