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Unlike similar, existing apps, NumberGuru [iTunes link] is free to download and offers an unlimited number of lookups.
The app has indexed 90% of landlines and more than 50% of cell phone numbers, say its creators. (Verizon Wireless numbers are not included, as that information is not available to anyone.)
App users can leave comments on the numbers they look up, alerting others to the existence of spammers.
As with the rest of BeenVerified.com's web and mobile apps, such as the Sex Offender Tracker, NumberGuru pulls the numbers from a large database of public records. It's all part of the company's larger mission to make those records better accessible to consumers.