title: My application is considered an unknown app
body: <p>I developed an application in android studio and signed it, but when I try to install that I have this alert message</p>
  
  <p><a href="https://i.stack.imgur.com/HOmXR.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/HOmXR.jpg" alt="enter image description here"></a></p>
  
  <p>that says <code>your phone and personal data are more vulnerable to attack by unknown apps...</code></p>
  
  <p>why when I sign the app get this alert?</p>
  
  <p>I must tell you that I live in Iran, may it be subject to sanctions? </p>
  
  <p>I changed the package manager and the sign allot of but doesn't work 
  and tried to put it on this site 
  <a href="https://support.google.com/googleplay/android-developer/contact/protectappeals" rel="nofollow noreferrer">https://support.google.com/googleplay/android-developer/contact/protectappeals</a></p>
  
  <p>but it keeps telling me <strong>cant download your app</strong><br>
  can anybody help me?</p>
  
  <blockquote>
    <p>Edited 
    My problem solved that's error to happen because i install my apk from my SD card to my phone when i exam that to another phone by Bluetooth and so on thats ok hope it's helpful for others</p>
  </blockquote>