title: Samsung Android device won't go in debug mode
body: <p>I have a simple problem, but thus far all of the advice found on this site and others have not helped.</p>
  
  <p>I am trying to debug, through eclipse, on to a samsung device (SCH-R720.)</p>
  
  <p>I have done this before with no problem.  I recently got a replacement device (same make and model, same sd card) and I have yet to successfully get the phone to enter Debug mode.</p>
  
  <p>When it is plugged in, I can see that the USB is connected in my phone's status tray, with the option to copy files to/from my computer (which works fine, by the way) - however, the "Debug mode" message never shows up, and my phone is not seen by eclipse or "adb devices"</p>
  
  <p>Here's what I have tried, in more or less increasing order of obviousness:</p>
  
  <p>In the device "Settings" I have allowed apps from unknown sources, and enabled USB debugging.</p>
  
  <p>I have tried different USB cables, with no change.</p>
  
  <p>I have installed, uninstalled and reinstalled the appropriate USB drivers for my phone on this laptop.  Note that these have already been installed, as I have done lots of debugging on this laptop previously.</p>
  
  <p>I tried clearing the cache of every app installed on my phone, and then simply did a factory reset (not a big hassle since I only got this phone recently.)</p>
  
  <p>In command prompt, I tried "adb devices" and none were listed.  I tried "adb kill-server" and this didn't help at all.</p>
  
  <p>In the Android SDK Manager, I verified that the Google USB Drivers were installed.  They were.  I then reinstalled the Android SDK and re-did all of the above steps, to no avail.  </p>
  
  <p>Also I should note that I periodically rebooted both my phone and my computer during these steps listed above.</p>
  
  <p>This is frustrating.  Anyone have this issue before, which wasn't simply caused by not having the drivers installed or something?</p>
  
  <p>Any help would be much appreciated.</p>