I've just came up with a oh so important question
Due to an UE regulation nowadays, phones sold in the UE have to have a micro USB charger (or in the case of the Iphone come with an adapter I think).
It's been a blessing, no more "do you have a samsung?" "no, only a nokia charger for the X46T, not the X34T"... You're always bound to find someone that can lend you a charger.
What about the rest of the world?
Manufacturers were perfectly happy to sell you their own chargers and I guess apart from a knockoff you had to buy a specific charger from them.
Now you can reuse or buy anywhere but in the end it might be cheaper for the manufacturers to provide a micro-usb charger that they can buy from any supplier - supplier that now only has one model making it quite cost effective.
So I'm wondering if some phone manufacturers wised up and put the micro-usb on all their phone or still stick to a proprietary charger because they can?