Recovering deleted messages and data on a mobile phone [closed]

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I want to design a mobile application/tool for recovering deleted messages/pictures/files from the phone. I have the choice to do that using A开发者_开发问答ndroid or Symbian. what do you think is more easier provided that I have to use some operating system concepts to solve the problem and recover deleted messages. Also what are the concepts that I can use for recovery ?

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Mobil platforms lock developers into a very small padded room. I don't think level of access will be possible unless the device is jail broken.

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I don't think you can have access to deleted messages in Symbian (unless you use some older pre 3rd edition phone model). And undeleting files and pictures from phone is also impossible.

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Android and Symbian have access to this information. Gone are the days of locked down J2me development. :)