Looking for one of the simplest and cheapest business opportunities? There are many ways to start a business, one simple idea is to create a reverse lookup directory where you grant access to cell phone numbers. If you can reach an agreement with the suppliers of such information as others have done and provide this service online it will have virtually no overheads or costs. There are many such businesses now and this is because Free Cell Phone Number Reverse Lookup sites are simple to setup - relative to other business types - and low maintenance compared to most other businesses.