A list of iOS secrets and hidden features?

[jsntrenkler]

Anyone have a list of secret and hidden features in iOS, could be any version just curious to see what everyone has discovered?

 

[Ujjwal Agarwal]

while surfing web found something might come handy sometimes
refer these articles
Top 23 Hidden iOS 7 Features That You Likely Don't Know About | Redmond Pie
25 Hidden iOS 7 Features

i know many of them already but some are there about which i was not aware
google buddy google
Let me google that for you