first, run you ionic app in your mobile device with live reload command use ionic Cordova run android -l this command, make sure that in your mobile device USB debugging mode is on then follow these command-
#1 Open Google Chrome
#2 Hit this URL chrome://inspect
#3 here you will see WebView in io.ionic.starter
#4 then click on the inspect button it will open a new window to inspect your page.
plz, keep in mind if your mobile in sleep mode it will so blank white screen. if you would not seeing anything then on your phone and open any screen of the Deployed app.