Tower Collector is described as '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' and is an app in the Network & Admin category. There are five alternatives to Tower Collector for Online / Web-based, Android, Android Tablet, F-Droid and Windows. The best alternative is openBmap, which is both free and Open Source. Other great apps like Tower Collector are CellMapper (Free Personal, Open Source), OpenCellID (Free, Open Source), Mozilla Stumbler (Free, Open Source) and GSMmap (Free, Open Source).
Quote : CellMapper is a useful app for locating 2G/3G/4G/4G+ base stations. The application measures the signal strength and other network data collected by end users and uses the data collected to locate network base stations and their coverage.