The European Union has called for every phone manufacturer to build Micro-USB chargers for their phones. While nearly every mobile phone company has adopted microUSB as the default charging option on devices, this was not done without some prompting. In the past, Apple have been the ones who have not played by the rules and gotten away with it.
Personally, I think that this is a good move by the EU. It will mean that you won’t have to worry about losing the proprietary charger which comes with your phone. Instead, just get a Micro-USB cable and plug it into your computer or wall socket and you are good to go.