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I could have sworn you asked how to to it on iPhone, but now that is gone.

Well, here it is anyway: From iPhone lock or home screen, drag down from the battery display in the upper right corner and you'll see battery % state of charge. You can even drag partly down and hold it momentarily. Just let go once you've seen the display, and the battery soc will slide back up to the top and hide away.
Yea, but that's not the same as seeing it at a glance just looking at the locked screen to check the charge level. I for one would be fine with having JUST the percentage over the battery icon if I had to choose.
 
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