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Using smartphones to virtually shop isnt a new idea, but Apple is bridging the digital experience with real-world retail through its iBeacon service. Starting today, those using the Apple Store app while shopping will get messages, notifications and alerts catered to their particular shopping needs. The service, which Apple announced alongside iOS 7, will roll out to Apples 254 retail locations across the United States. Provided you give the app permission to do so, iBeacon tracks your iPhone as youre shopping to send tailored messages depending on where you are within the store. The service uses low-energy Bluetooth transmissions to broadcast a users location indoors, allowing the app to pinpoint whether youre browsing through iPhone accessories or playing with a MacBook Air. MORE: Best Tech Gifts 2013 For example, if youre standing by the iPhone table, the app may prompt you with a message asking if youd like to upgrade. The service could also send you an alert to tell you when youre device is eligible for an upgrade. iBeacon could also be used to notify you if a computer or device you ordered is ready to be picked up. Simply show this screen to an Apple employee, and the clerk can grab it from the back for you. Nearly 20 iBeacon transmitters have been turned on at Apples flagship New York City location at Fifth Ave., according to the AP. Some of these devices are actual Bluetooth transmitters, while other signals are generated by iPads within the store. Each iBeacon is fixated at different distances to send alerts based on your precise location. Such accuracy isnt possible with GPS, which doesnt offer as efficient location tracking indoors. This isnt the first time major retailers have used smartphones to reach their patrons. Last month, Macys began tracking its customers iPhones through the Shopkick app to send shoppers in-store deals and notifications. Via Associated Press Best Mobile Products of the Year Top Holiday Gift Ideas 2013 Top iPhone 5s Camera Gifts Copyright 2013 LAPTOP Magazine, a TechMediaNetwork company. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.