Wireless Analyzer Tool -- Google Play

1. Have a good tool in android mobile for signal strength .
     If you want to know wireless signal strength, you can go to the Google Play store to download the
     Wifi Analyzer.

2.  First entering into the this tool, you can see the alive numbers of Wifi AP.

     You can detect your AP signal strength if it is enough for your station device,

3. The secondary kind of  display view.

4. This view is timing graph with signal strength for all Wifi APs in your environment.

    You can long-click the SSID which you want to see at the top. Then you can just see the SSID
    timing graph with signal strength.

5. This view, it will tell you what channel is better for your environment. 

    Then you can set the channel in you Wireless Gateway.