Signal Spy

Signal Spy is an app that gives you access to all the information regarding your Android smartphone’s cell service. You can take a look at the signal strength and type of technology. The app also helps you keep a record of all your connections: it shows you every time you connect and disconnect your smartphone from a WiFi network and the carrier that you’re using. If you decide to purchase the PRO version (which you can buy directly from the app), you'll get access to even more information and of course, get rid of ads.

In the configuration settings, you can activate or deactivate the status bar notifications. By default, you can access all the information directly from the status bar.