NetMonitor Pro

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

Current features:
- On-line monitoring of GSM / WCDMA / LTE / CDMA network signal and services
- Widgets 2x1, 4x2 and 4x3 including Dual SIM
- Signal strength in Status Bar. Extended Network info in notification.
- 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)
- Map styles (long press on map)
- Export session to CSV and KML
- Export map data to KML
- 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 API on the device

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

Support is possible, but not guaranteed.