Word Press cannot handle questions the way Google does. For this WordPress, OpenBTS by itself yields the best results for Phi Beta Iota: OpenBTS. See especially Range Networks: The ONLY OpenBTS Real Deal.
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Wikipedia: OpenBTS (Open Base Transceiver Station) is a software-based GSM access point, allowing standard GSM-compatible mobile phones to make telephone calls without using existing telecommunication providers’ networks. OpenBTS is notable for being the first free software implementation of the industry-standard GSM protocol stack. It is written in C++ and released as free software under the terms of version 3 of the GNU Affero General Public License (AGPL).