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Linphone - Linphone is an internet phone or Voice Over IP phone (VoIP).
Android IMSI-Catcher Detector - Detect attacks of fake base stations such as IMSI-Catcher and StingRay on your GSM/UMTS network.
Zoiper - Cross-platform VoIP softphone dialer for SIP and IAX systems
CellID Finder - Find a cell phone location using LAC/CellID, GSM BTS coordinates
Sipdroid - Free and open-source SIP/VoIP Client
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!