I thought this was impressive, until I checked my phone bill. They use an astonishing 55 digits, which is enough to number individually every water molecule on Earth. Put another way, if every star in the universe has nine Earth-like planets around it, and each of these planets has an Earth-scale population, and every inhabitant of each of these planets has a telephone, and each of thse phone owners gets a phone bill once a month for the entire lifetime of the universe, you'd still have ten digits to go around.
Talk about universal service.