Integrating AD RMS with Exchange 2013, but my Iphone (IOS) can not decrypts message.

I can not  read original message and I recieve message "This message uses Microsoft Information Protection solutions. Open this item using an email application that supports protected messages, such as Microsoft Outlook. You can download a free trial of Microsoft Office at http://go.microsoft.com/fwlink/?LinkID=147091. Learn more about Information Protection solutions at http://www.microsoft.com/rms." 

Please help me find a solution?