Memorizing "phone numbers" could it made easier by using coloured numbers?

Question

My friend has a coloured numbers on his mobile (when he deal a phone number, he get coloured numbers: 3 is red for ex..) and he doesn't even now why!?? :p

thank you.

(I know people don't ve to remember phone numbers any more, so i ask this question out of curiosity)

Answer 1

It might work. I just use mnemonics for remembering numbers.