In November 2003, cellular service providers must allow customers to keep their phone number when they change carriers.

The ChangeWave newsletter is telling us that there is a company that sells a number portability and number inventory management software and some other applications to most of these cellular carriers.

As they say, the stock went up recently and has a trailing P/E ratio of 16, sells for 8 times cash flow and will be growing earnings at 30-40% in the next 18-24 months.

I think the name of the company is Evolving Systems (NasdaqSC: EVOL). This Denver company has the highest share price appreciation over the last 52 weeks, as per Motley Fool's Bill Mann.