GSMmap!

The OpenSignal app will allow you to do several things, such as:

AIMSICD is an Android app to detect IMSI-Catchers. These devices are false mobile towers (base stations) acting between the target mobile phone(s) and the real towers of service providers. As such they are considered a Man-In-The-Middle (MITM) attack. This surveillance technology is also known as "StingRay", "Cellular Interception" and alike. Find out more in our Wiki on GitHub.

This app collects GPS locations of GSM/UMTS/LTE/CDMA cell towers and sends them to OpenCellID.org database. It is designed to help map the extent of mobile phone network coverage. It is also possible to collect measurements for private purposes and export them to CSV or GPX files.

Radiocells.org is a community project to collect informations on cell tower and wifi base stations and bring them on a map.The project itself was founded in 2009, then under the name openbmap.org.

Mozilla is a nonprofit project and global community building a better internet. Mozilla Stumbler is an open-source wireless network scanner that collects GPS data for the Mozilla Location Service, our crowd-sourced location database. As you move around, the app "stumbles" upon new Wi-Fi networks and cell towers. The Mozilla Location Service combines these wireless network measurements to provide geolocation services for Firefox OS devices and other open source projects. For more information, visit our project page:• https://location.services.mozilla.com »

Cellumap is a revolution in cellular coverage maps, in that the coverage maps here are not created by the network operators, but rather by the users of the network (ie: you!). The coverage maps that are given publicly by the network operators are usually very high-level (ie: not very detailed, no signal strength info) and become quickly out-of-date as the network changes almost daily. Cellumap allows people to plot accurate points (using GPS) and with actual recorded signal strength (and other information) in real-time! Your privacy is also guaranteed, as there is no phone number or account info ever recorded or displayed. »

Simple and reliable program to detect activity of GSM Monitoring System equipment designed for active and passive interception of voice and data of any GSM networks. Supports up to 4 GSM bands (850, 900, 1800, 1900), making it applicable anywhere in the world where GSM network is available