I recently became one of the many in the world carrying a smartphone in my pocket. I made the jump to an iPhone4 this month and it has opened my eyes to a whole new world. The one thing I was amazed at was the number of barcode scanner apps that you can download. Some of them are free (which I obviously prefer) and some are the usual .99 cents. I downloaded a couple of the free barcode shopping apps and was suprised how easy it was to get prices on the items you use everyday. You just scan your items with your iPhone camera and from there you can compare internet and local prices and in some cases you can even read product reviews. If you have the time and are really interested in what prices you are paying then this might be something you are interested in. Here is a photo from one called ShopSavvy. There are many of them in your iTunes store.
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