Apple is offering a free exchange for certain of its European USB power adapters:
Apple has determined that, in rare cases, the Apple 5W European USB power adapter may overheat and pose a safety risk. This adapter came with iPhone 3GS, iPhone 4 and iPhone 4S models shipped from October 2009 to September 2012 in the countries listed below. It was also sold as a standalone accessory.
Here’s how to identify an adapter that needs to be replaced:
Look at the label between the prongs on your adapter and compare it to the images outlined in red below. The model number and the color of the letters “CE” are the ways to identify an affected adapter.
An affected adapter features Model A1300 and the letters “CE” in solid gray. If you have an affected adapter, discontinue use and exchange it for a new one. You can charge your iPhone by connecting it via a USB cable to your computer until you receive a replacement adapter.
To learn more, visit Apple’s official adapter exchange page.