The hoax suggests that dialing 999 and immediately hanging up gives a battery boost to a cell phone. There are just two problems with this. First, it doesn't actually work. Second, 999 is the number for emergency services... it is the 911 of the UK. According to Huffington Post in the United Kingdom, so many people have been fooled by this trick that both the Derbyshire and Bedfordshire police have issued warnings about misusing the 999 number. Not only is it a criminal offense, the police could disconnect the phones used to make such calls.
Is it possible that people fooled into believing something so daft don't realize that an emergency center must investigate all calls, even hang-ups?
So before the prank makes it's way across the pond, let's be clear: To charge a cell phone, you must put it on a cell phone charger!!