For Android 5.1 or higher. Dual SIM support. Try free version before buying. To see Cell on map BTS file must be loaded. ARFCN and Band are available for Android 7 or higher.
App could be usefull for cellular network engineers.

Current features:
- On-line monitoring of  NR / LTE / WCDMA / GSM / CDMA network signal and services
- Monitoring and Analysis modes
- Widgets 2x1, 4x2 and 4x3 including Dual SIM
- Signal strength in Status Bar. Extended Network info in notification
- Signal strength and Network info in notification on Android Wear watches
- Keep Million and more measurements in a database and view them offline
- Dark and light Themes
- Data collection in the background for both SIMs
- Display network technology and signal strength on the map
- Display sector azimuths on map (BTS file is needed)
- Site Explorer (BTS file is needed)
- Map styles (long press on map)
- Export session to CSV and KML
- Export map data to KML
- Share Sessions using export/import of Session in JSON format
- Export list of unique cells
- Measurement statistics
- Load and use external BTS file with additional cell data 
- Copy and analyze sqlite database on a PC
- Use implemented Content Provider  in your own applications to retrieve data from the database

Limitations:
- Correctness of the data is highly dependent on the correct and full implementation of the Google Android API on the device

For questions and suggestions:
net.monitor.mobile@gmail.com

Support is possible, but not guaranteed.

Cellular network 5G/4G/3G/2G monitoring/logging(for mobile network engineers)