An adapter sold with older models of the iPhone could overheat, says Apple, offering a replacement program to swap it for a redesigned version. Apple has recalled adapter plugs sold with older iPhones amid concerns they might overheat. "In rare cases," Apple warns, the 5W European USB power adapter "may overheat and pose a safety risk."

The adapter for European two-prong power sockets comes with the iPhone, and is also sold as a separate accessory. According to Apple, the only plugs with a problem are those that were sold with the iPhone 3GS, iPhone 4 and iPhone 4S between October 2009 and September 2012. If you have one of the older, potentially defective adapters, Apple will swap it for one of the redesigned versions.

To check your plug, look between the twin prongs: the affected adapter has the model number A1300 with the letters CE written in solid grey letters.Should your plug have the model number A1300, with the letters CE outlined in grey, then you're OK.

Affected countries outside Europe include Egypt, South Africa and Vietnam.