OpenCellID - OpenCelliD is the largest Open Database of Cell Towers & their locations. You can geolocate IoT & Mobile devices without GPS, explore Mobile Operator coverage and more!

CellID Finder - Find a cell phone location using LAC/CellID, GSM BTS coordinates

wigle.net - WiGLE (Wireless Geographic Logging Engine)

OpenSignal - Mobile analytics and insights on wireless connectivity from Opensignal, the independent global standard for understanding the true state of the world's mobile network.

Proxidize - Proxidize is the world's premier self-hosted 4G mobile proxy solution! With Proxidize at your fingertips, building a 4G mobile proxy network of any size is a breeze - absolutely no technical expertise required, we got you covered!

Android IMSI-Catcher Detector - Detect attacks of fake base stations such as IMSI-Catcher and StingRay on your GSM/UMTS network.