Europe

It wouldn't hurt to make them standardized somehow, otherwise it might be that you can replace the battery but can't find one to buy, or if you do it's more expensive than it's worth and it motivates you to buy a new phone entirely.

And +1 vote for the fucking headphone jack. A standard in the audio industry since (looking at wikipedia) for over a century! killed off by Apple (and subsequently everyone else's) corporate greed.