title: Android Unsigned App not able to install on device
body: <p>My app able run on simulator and I export it as Unsigned App.</p>
  
  <p>On my phone's Setting-->>Applications--->>Unknown sources  checked.</p>
  
  <p>I download the .apk into phone storage through USB.</p>
  
  <p>Then under File Manager, I found that stored .apk and hit install button and it try to install,</p>
  
  <p>But finally it says Application Not installed. but why? wht's wrong?</p>
  
  <p>Also I try ./adb install -r myapp.apk but it said error:device not found </p>