XPost: comp.mobile.android, sci.electronics.repair   
   From: stijndekonlng@nlnet.nl   
      
   On Sun, 19 Mar 2017 20:26:25 -0700, Jeff Liebermann wrote:   
      
   > What you should be asking is what disables wi-fi   
   > scanning.  That's easy, 2 ways.   
   > 1.  If your phone is setup to act as a hot spot so that others can   
   > borrow your cellular data bandwidth, it will kill scanning.  That's   
   > because a hot spot requires that the channel number be fixed and not a   
   > moving target.   
   > 2.  If your phone is in peer to peer mode instead of infrastructure.   
   > There are many reasons for this to happen.  For example, printing   
   > directly to an HP ePrint printer or Apple Airprint printer.  I think   
   > (not sure) that a GoPro camera connection does the same thing.   
   >   
   > Note that the phone cannot be in infrastructure (what you want) and   
   > peer-to-peer mode (what you don't want) at the same time.   
      
   Those are both good answers as to what disables wifi scanning.   
      
   The phone has never been set up as a hotspot since the last factory reset,   
   although it certainly would be possible to set it up as a hotspot since   
   it's T-Mobile which allows that on all their phones. But it's not currently   
   set up as a hotspot to my knowledge. But that's an interesting observation.   
      
   I'm not sure what "peer-to-peer mode" is for Android.   
      
   Googling   
   https://www.google.com/search?q=android+peer-to-peer+mode   
      
   I found this:   
   https://developer.android.com/guide/topics/connectivity/wifip2p.html   
   Which says that two Android devices can connect in peer-to-peer mode (aka   
   WiFi Direct).   
      
   I have never used WiFi Direct so I don't think it's in peer-to-peer mode.   
   Besides, the phone connects to WiFi when I manually type in the (very long   
   complex) SSID.   
      
   It just won't find any SSID when I press the scan button.   
   I think it's time for a factory reset, which should fix the problem.   
      
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