How many could you remember?
Is it easier when you say the numbers
aloud?
Try saying the days of the week in between
the digits when you repeat them back?
Most people find this very difficult and
can only manage a few numbers.
Most people can remember between 5 and
9 digits so long as they keep repeating the numbers
to themselves. This is the limit of your working memory,
the part of your memory you use to remember things shortterm.
A mobile phone number of ten or eleven
digits is too long for your working memory. This is
why it's very difficult to repeat the number in your
head.
People use different methods to memorise
new phone numbers. Do the numbers remind you of a historical
date or might they form a rhythm when said aloud? Are
any of the digits the same as your house number or someone's
age? Do two numbers add up to make a third?
Another, far less efficient way
to remember a phone number, is simply to repeat it over
and over  and eventually it will enter your longterm
memory.
