Do you have a need to send information in a super duper secret way to and from iOS devices? Wickr aims to fill that niche - for both good and ill.
Wickr allows you to "send self-destructing messages for free to other Wickr users anywhere in the world while leaving no trace." According to Wickr, not even they can retrieve the information. So there's no evidence, incriminating or otherwise. https://www.mywickr.com/en/index.php