How do I access the text of a message/SMS mobile

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I am using mobileComposeTextMessage to send a "text" encrypted over to another phone/device. Now at the receiving end I want access to the "text" from my app so that I can decrypt it and display to the user. What I cannot figure is how to get access to the "text". Is there a way to get to it (Android/iOS) or will I have to roll my own messaging app to send an encrypted text message(SMS) and decrypt it ? Thanks a lot in advance for any help.

Livecode 6.6 Android (latest) iOS (latest)