Clueless in Cleveland? Use your thumb

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: Eat,” which ranks what it considers the top 100 restaurants in 50 American cities. Tapping “Near Me” finds places nearby from that list, along with reservation numbers and directions.

What to do

Need an ATM? Thirsty for a sakitini? Several location-aware apps are vying to be your mobile concierge. Among the best are Yelp (free), which has a fanatical base of reviewers who weigh in on everything from dry cleaners to karaoke bars. Where (free) lets you scroll through different services and plots them on a Google Map, along with your location. And iWant (free) offers a similar service, but in a streamlined interface with clean black-and-white icons: a martini for bars, a projector for movies, a hanger for clothing stores, and so on.

Traditional travel guides are getting into the action. Frommer’s has turned several of its guides, including New York, Paris and London, into iPhone apps ($9.99 each). The e-guides offer many of the same maps, reviews and suggested itineraries. But unlike Yelp, Frommer’s doesn’t take advantage of location-aware technology.

How to get around

Numerous subway and mass-transit apps are available for major cities, with the best offering clean design, location-based station finders and service advisories. Worthwhile apps include CityTransit (for New York City, $2.99), Tube London City ($9.99) and iBart (for the San Francisco area, free).

Taxi! (free) has a yellow cab-inspired design and finds taxi services throughout the United States. Just tap one of the companies, and the iPhone dials it for you. It also offers user ratings, whether the company accepts credit cards and, according to the App Store’s description, a prescreened list based on hotel referrals. Cool Tools Until Skype creates an iPhone app, Truphone may be the closest thing. It allows you to make cheap international phone calls over Wi-Fi (about 6 cents a minute to landlines and 30 cents to mobile phones), especially when compared with roaming rates.