Features:

LTE, UMTS and GSM Cell locations from Mozilla Location Service (MLS), along with location accuracy -
6 signal-meter gauges for the serving (registered) cell and the neighbor cell signal strengths
6 parallel signal strength (dBm) vs. time plots of the serving (registered) and neighbor cells
Cell measurements Save log file capability (under the map tab)
Distance limit (0m, 5m, 10m, ...) between consecutive measurements in MAP tab (if network doesn't change)
Location accuracy limit option for measurement logging
Motion detector with selectable sensitivity options (applicable to measurements)
Sound notifications when wireless network technology generation (2G/3G/4G) and cell id change (OFF by default; you may turn them ON inside the Settings)
Databases export types MLS Geosubmit v.2, CLF v.3, OpenCellID csv, (and our own) CMWF
Connection Statistics: percentage (Bar Plot) of 2G/3G/4G connection times with cellular Data ON or OFF
2G/3G/4G network type notifications in the notification area
Concurrent map view and signal-meter gauges
Route coloring (in the map tab) according to the signal strength, and map markers with location and signal info
Map view options: Normal, Satellite, Terrain, Hybrid
Map memory caching, incl. measurement and cell location markers (provided you exit app through power off)
Raw view of detailed network signal info, network info, including signal strength, serving and ALL neighbor cell information
Cellular Data on/off and Roaming on/off indications
SIM and device info
Ability to turn off Gauges individually by tapping, to release some CPU burden
Screen rotation (portrait or landscape)
No dual SIM support yet