Since I went to 7.0.2 last night, the letters that appear on the keys as I type my alphanumeric passcode are white on light gray, whereas they were black on light gray in 7.0. They are now almost impossible to see, making typos much mire likely. Was this a deliberate change or a bug? Is there a way to submit bug reports for iOS? (I've only had an iPhone for two months and it's my first Apple priduct, so I don't know how bugs get reported.)