Android Pie (9.0) - "No Signal Indicator" Solution
Android 9.0 (Pie) - No Signal Indicator
Looking at the Android firmware 9.0, it doesn't seem to have the service indicator in the top corner. So to solve this issue I've modified the signal strength app for Full Premium by default.
This app has an excellent widget showing the signal type (cellular or wifi) and its strength. Note: the closer to 0 (zero) on the dBm, the stronger the signal is.
If you have a Samsung device, you can go to the Samsung app store and download Good Lock. Within Good Lock you install Quick Star. With Quick Star you can add the signal Indicator back, as well as some other custom modifications to the pull down menu.
Download the modded app below or pay for it on Google play to show the developer some love.