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Voice over Long-Term Evolution is an LTE high-speed wireless communication standard for mobile phones and data terminals, including Internet of things devices and wearables. 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 headers are smaller than those of unoptimized VoIP/LTE. VoLTE calls are usually charged at the same rate as other calls.
To be able to make a VoLTE call, the device, its firmware, and the mobile telephone provider must all support the service in the area, and be able to work together. VoLTE has been marketed as HD Voice by some carriers, but this is not the same as the VoLTE standard. Moreover, HD+ is what actually is used only in LTE; HD Voice was available in 3G too.