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iPhone app rounds up free Redbox rental codes

Sure, Redbox rentals are already pretty cheap at just $1 per night, but why not get them free if you can? This app rounds up all the free-rental codes you could need.

This 99-cent app serves up a wealth of free Redbox rental codes.

Good news for fans of Redbox movie-rental kiosks: the new Redbox app (free) lets you browse and reserve movies and find the kiosk nearest you. Cool.

Better news for Redbox fans: the new Red Box Free Rental Promo Codes app (from third-party developer Neese) means you may never have to pay for another movie.

The app aggregates codes from around the Internet and various promo mailings, updating them every 12 hours so you're sure to have the latest and greatest.

When you get to the Redbox checkout screen, just tap "Rent with a Promo Code," then type in any of the codes listed in the app. If one doesn't work, try another.

Red Box Free Rental Promo Codes costs 99 cents, so the first time you nab a free rental, it pays for itself.

I haven't had a chance to put the app to the test just yet (it does require a visit to a kiosk--you can't use the codes when reserving movies), but I'll update the post if I run into any problems. To me it seems like a can't-miss way to score free movie rentals.

While we're on the subject of using your iPhone to save money, be sure to check out "Five iPhone apps that can save you money," "iPhone apps for Black Friday shopping," and eBay's new holiday-deals app.

All this gets me wondering: Could your iPhone actually start paying for itself? I mean, if you can rack up 70 bucks' worth of savings per month by way of various apps, that would cover the cost of AT&T's low-end plan. Hmmm...