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GSM services. GSM services are a standard collection of applications and features available over the Global System for Mobile Communications (GSM) to mobile phone subscribers all over the world. The GSM standards are defined by the 3GPP collaboration and implemented in hardware and software by equipment manufacturers and mobile phone operators.
Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the four major cellular carriers in the country—AT&T Mobility, Boost Mobile, T-Mobile US, and Verizon—and offer various levels of free and/or paid talk, text and data services to their customers.
OpenBTS. OpenBTS (Open Base Transceiver Station) is a software-based GSM access point, allowing standard GSM-compatible mobile phones to be used as SIP endpoints in Voice over IP (VoIP) networks. OpenBTS is open-source software developed and maintained by Range Networks. The public release of OpenBTS is notable for being the first free-software ...
www.h2owireless.com. h2o Wireless is a United States-based prepaid cell phone service, that utilizes the AT&T network. [2] It is a brand of mobile virtual network operator (MVNO) Locus Telecommunications, a subsidiary of Telrite Holdings, Inc., since 2019. [1][3] Locus was formerly a subsidiary of KDDI America corporation, starting in 2010. [3 ...
Wi-Fi calling. Wi-Fi calling, also called VoWiFi, [1] refers to mobile phone voice calls and data that are made over IP networks using Wi-Fi, instead of the cell towers provided by cellular networks. [2] Using this feature, compatible handsets are able to route regular cellular calls through a wireless LAN (Wi-Fi) network with broadband ...
The voice group call service ( VGCS) is a mobile communication service for GSM, that allows subscribers to communicate to multiple other subscribers at the same time. For this special mobiles are required that support this function. A first deployment was seen with European Railways. This service is a feature of ASCI (Advanced Speech Call Items ...
Voice over LTE. Voice over Long-Term Evolution (acronym VoLTE) is an LTE high-speed wireless communication standard for voice calls and SMS using mobile phones and data terminals. [1][2] VoLTE has up to three times more voice and data capacity than older 3G UMTS and up to six times more than 2G GSM. It uses less bandwidth because VoLTE's packet ...
Voice over NR. VoNR or ' Voice over New Radio' (also referred to as Voice over 5G or Vo5G) is a 5G high-speed wireless communication standard for mobile phones and data terminals, including Internet of things (IoT) devices and wearables. [1] VoNR fully utilizes the 5G Standalone (SA) core and can have better voice quality than its predecessor ...