On iOs 7 when you battery is flat and you try to power up your iPhone there has been a design tweak to show a more simplified battery icon.
On my iPhone 5 at the bottom of the screen there is also a picture of a lightening cable sized connector, do iPhone 4 users etc see a different image relating to the older connector?
On my iPhone 5 at the bottom of the screen there is also a picture of a lightening cable sized connector, do iPhone 4 users etc see a different image relating to the older connector?