Russia Calling Code Flag Number 7

Russia is the small club of nations to have a single digit for its calling code.  It is code 7 for international called to Russia.  The field is violet since the 7th colour of the rainbow is violet.  Likewise the yellow phone is the assigned contrast indicator.

Only Canada, USA, and Russia get single digit codes.   Although Russia may be #7, she get a private digit.  Canada & the USA have to share the same number: #1.

Although no Russian colours are apparent, if you mix red and blue, you get violet.
https://moskva.mts.ru/personal