Apple is famous for its perfect hardware product, but they can't make sure that there is no problem about any device. Such as the new problem which was exposed recently time, the sleep button can't work freely, and they are building a normative plan to change the sleep button.

If your sleep button doesn't working properly, you could log in this website - https://ssl.apple.com/support/iphone5-sleepwakebutton/. See the corresponding process to replace your sleep button of iPhone 5.
As of April 25, 2014, the replacement process will be available in the U.S. and Canada. In other countries, it will be available to inspect and replace since May 2, 2014, as long as you are iPhone 5 user.

How to Send Your iPhone 5 to An Apple Maintenance Center?

Carry-in

* Take your iPhone 5 to a provider - Apple Retail Store or Apple Authorized Service Provider.
* Your iPhone will be examined. If it has any problem, then sent it to the local Apple Maintenance Center.
* You will be notified to get your iPhone 5 after repairing.
During the repair time, if you need a loaner, then participate the Apple Retail Stores and Apple Authorized Service Providers will offer you an iPhone 5 (16GB only).

Mail-in
* Call Apple and apply for a postage paid way to send your iPhone 5 to the local Apple Repair Center.
* Your iPhone will be examined by the Repair Center.
* Your iPhone 5 will be sent to you by mail after repairing.
Apple did not disclose the specific number of users who face this problem. But the company claims that this issue may affect the production during the March 2013 iPhone 5. In fact, Apple began selling the iPhone 5 as early as the autumn of 2012.

Nevertheless, what makes people shocked is Apple has launched the replacement plan after a long time although they found this problem already.