Unfortunately, the in-store screen replacement service is only available for the iPhone 5, the newest version of Apple's iPhone. It is unlikely that older versions will be included since the unit is likely set up for the 4in screen of the iPhone 5.
Currently Apple Store staff are only able to carry out replacements of batteries, vibrator motors, speakers, receivers and home buttons in store. Under the new plans revealed at a Apple meeting in May, the Apple store staff will be able to replace the display, cameras, sleep/wake button, and logic board.
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