WhitePages Mobile has a Recent Results page that stores your 20 most recent searches, five more than are stored on the Recents page People. Another key difference is that People's Clear button only lets you erase all recent searches, while WhitePages Mobile selectively deletes recent searches. Just tap Edit followed by the red minus sign next to any search result you wish to vanquish.

Search results that turn up work numbers are clearly labeled in WhitePages Mobile with a Work icon. What's more, the app offers a separate search function for businesses, either by a business name or category ("pizza," for example, if you want to look up all the pizza joints in a given town). Business search results are very location-specific--you'll only get listings for businesses in the city you enter, as opposed to the surrounding area, and WhitePages Mobile doesn't make use of the iPhone's location feature to say how close those businesses are to you.

One other limitation for WhitePages Mobile is that search results are limited to 30 listings--there's also no Web link to additional listings as there is with People. This is rarely a problem when you're looking up a person's number, but if you're conducting a business search--taxis in San Francisco, say--you'll only get a smattering of listings restricted to the first few letters of the alphabet.

That limitation aside, WhitePages Mobile does just about everything you could ask in a phone-based people finder--with a few flourishes that make it an extra useful addition to your mobile device.

WhitePages Mobile is compatible with any iPhone or iPod touch running the iPhone 2.x software update.