Voice over LTE

Voice over Long-Term Evolution (VoLTE) is a standard high-speed wireless communication for mobile phones and data terminals, including Internet of things (IoT) devices and wearables. It is based on the IP Multimedia Subsystem (IMS) network, with specific profiles for control and media planes of voice service on the LTE wireless broadband service defined by GSMA in PRD IR.92.[1] This approach results in the voice service (control and media planes) being delivered as data flows within the LTE data bearer, with no dependency on (or ultimately, requirement for) the circuit-switched voice network to be in the call path. 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.[2]

iPhone with active VoLTE call

VoLTE calls are usually charged at the same rate as other calls. A claimed advantage is that the signal penetrates buildings better, eliminating indoor "blackspots" without reception.[3]

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. For example, the Three UK network as of 2019 supports VoLTE (which it brands "Super Voice") on phones supplied by Three (and a few others),[4] and other networks do not support it on "Pay-as-you-Go" (PAYG) phones.

History

In August 2012, MetroPCS launched the world's first commercial VoLTE services in Dallas, Texas, in the United States, alongside the first VoLTE phone, the LG Connect 4G.[5]

In May 2014, Singtel introduced the world's first commercial "full-featured" VoLTE service in Singapore, only in combination with Galaxy Note 3, it was subsequently expanded.[6]

In June 2014, KT showcased the world's first cross-border roaming services based on Voice over LTE. The South Korean operator partnered with China Mobile to develop VoLTE roaming services.[7]

In October 2014, operators based on IMS local breakout architecture with home routing systems.[8]

In November 2014, Verizon and AT&T announced the companies are enabling VoLTE-to-VoLTE connections between their respective customers. VoLTE interoperability between Verizon and AT&T customers began in 2015. Testing and design were performed between both companies using third party networks such as Alcatel-Lucent.[9] This was stated to have been completed in November 2017.[10]

On 11 July 2015, SEATEL Cambodia announced the world's first commercial 100% VoLTE service without 2G/3G in Cambodia.[11][12][13][14][15]

On 14 September 2015, Orange Romania launched the VoLTE service for Samsung users in Romania. [16]

On 16 September 2015, Telstra announced that it had started enabling VoLTE across its network, including calling to National Broadband Network and business and enterprise services with HD handsets.[17]

On 30 November 2015, Telenor Denmark launched VoLTE for all Samsung Galaxy S6 phones, which has since been followed by additional Samsung and Apple models.

In 2016, Vodafone Netherlands launched VoLTE support, along with Wi-Fi Calling.[18]

On 30 June 2016, YTL's YES launches 4G LTE service to become Malaysia's FIRST VoLTE service provider.

In June 2016 Movistar Peru[19] launched commercial VoLTE service in Peru, starting in Lima and Callao for Samsung Galaxy S6, S6 Edge and LG G4 phones. Service will be enabled progressively in other departments and handsets. Movistar Peru is the first operator in the country offering this service.

In July 2016, Etisalat became the first operator to launch VoLTE in UAE.

In July 2016, PT Smartfren Telecom launches VoLTE services working in partnership with Mitel, and become Indonesia's first VoLTE service provider.[20]

On 1 September 2016, Dialog Axiata launched commercial VoLTE service in Sri Lanka.[21]

On 5 September 2016, India's first 4G-only network Jio launched their commercial VoLTE service without 2G/3G based services.[22]

In October 2016, Orange Polska launched commercial VoLTE service in Poland, followed by T-Mobile Polska the following month.

On 7 December 2016, Telenor Denmark launched VoLTE for all phones with VoLTE support.

On 8 March 2017, Cosmote[23] is the first operator that launched VoLTE (and VoWiFi) service in Greece.

On 24 April 2017, TIM launched VoLTE for all phones with VoLTE support in Italy.

In June 2017, Pakistan's Largest telecom operator Jazz has tested VoLTE over its network. Jazz plans to commercially launch it in July 2017.

In June 2017, Bahrain's Largest telecom operator Batelco has semi-launched the service to iOS users.

In July 2017, Digi.Mobil (RCS & RDS) will be the second carrier that launches commercial VoLTE services in Romania.

In July 2017, TIM Brasil was the first carrier to sell VoLTE on Brazil.[24]

In August 2017, Proximus was the first to activate VoLTE in Belgium. Customers were notified by SMS that the service was available.

In September 2017, Swazi Mobile was the first to activate VoLTE in Swaziland.

After this Bharti Airtel also launched the commercial VoLTE service in India.

In October 2017, Nova was the first to activate VoLTE in Iceland.

In November 2017, Telia Company was the first to activate VoLTE in Lithuania.

In November 2017 Entel Peru enabled VoLTE service in Peru, starting in Lima and Callao for Apple iPhone SE, Apple iPhone 6, Apple iPhone 6 Plus, Apple iPhone 6S, Apple iPhone 6S Plus, Apple iPhone 7, Apple iPhone 7 Plus, Apple iPhone 8, Apple iPhone 8 Plus, Apple iPhone X, Huawei Mate 9, Huawei Mate 10 Lite, Huawei P9, LG G4, Motorola MOTO C 4G, Motorola MOTO E4 Plus, Motorola MOTO G5S Plus, Samsung Galaxy J7, Samsung Galaxy S8, Samsung Galaxy S8+, Sony XPERIA L1 and Sony XPERIA XA1 Ultra phones.

In December 2017, Jamii Telecom Limited (JTL), offering broadband data services under the 'Faiba' brand, Jamii Telecommunication Ltd - Home was the first to activate VoLTE in Kenya.

In February 2018, Vodafone India's VoLTE, went live in the Delhi NCR circle, Gujarat and Mumbai[25]

In March 2018, SS7ware, the company behind Yate, launched VoLTE Lab, intended for use as a VoLTE test bed and learning environment.[26]

In May 2018, Play launched commercial VoLTE service in Poland for supported iOS devices.

In June 2018, Orange and Telenet announced that VoLTE will be launched in Belgium.

In January 2019, Mobitel (Sri Lanka) launched VoLTE.

In February 2019, WOM announced that VoLTE along with WiFi Calling will be launched in Chile. Currently working on select android devices (Samsung s8 and above, in addition to other Huawei models)

In August 2019, SMART Communications has launched the VoLTE service in Metro Manila, Philippines to provide high-definition voice call quality.[27] With Samsung devices to support this feature[28]

In August 2019, Tigo Colombia enabled VoLTE in the country, available for users with the following devices: Huawei Mate 20 Pro, P20, P20 PRO, P30, P30 PRO, P30 Lite, Samsung S9 - S9+ and iPhone from SE and forward. And also Sony Xperia 1.

U.S.-based Tracfone plans to require VoLTE devices by summer of 2020.[29]

As of 2020, almost all new phones for sale support VoLTE.[30]

Deployment
Main article: List of LTE networks

As of February 2019 there were 253 operators investing in VoLTE in 113 countries globally, including 184 operators with commercially launched VoLTE-HD voice service in 87 countries, up from 137 operators in 65 countries 12 months previously, according to data from the Global Mobile Suppliers Association.[31] By August 2019, these numbers had risen to 262 operators investing in VoLTE in 120 countries and 194 operators with launched VoLTE-HD voice services in 91 countries.[32]

A list of commercial VoLTE deployments around the world can be found in the main article above.

Devices
Main article: list of smartphones with HD Voice support

This is an incomplete list.

Mobile devices with support for VoLTE
Brand Name Note
Alcatel LINKZONE [33]
ONETOUCH Fierce XL [34]
Apple iPhone 6 and 6 Plus [35]
iPhone 6S and 6S Plus [36]
iPhone SE (1st generation) [37]
iPhone 7 and 7 Plus [38]
iPhone 8 and 8 Plus [39]
iPhone X [40]
iPhone XR [41]
iPhone XS and XS Max [42]
iPhone 11 [43]
iPhone 11 Pro and Pro Max [44]
iPhone SE (2nd generation) [45]
Andromax E2 [46]
R2 [47]
Asus Zenfone 3 [48] ZE520KL, ZE552KL
BlackBerry DTEK50 [49]
Priv [50]
Coolpad Catalyst [51]
Fujitsu Arrows NX [52] F-02G, F-05F, F-04G
Essential Essential Phone
Google Nexus 6P [53]
Pixel and Pixel XL
Pixel 2 and Pixel 2 XL
Pixel 3 and Pixel 3 XL
HTC 10 [54]
Desire 524 [55]
Desire 526 [55]
Desire 530 [56]
Desire EYE [57]
J butterfly [54] HTV31
One A9 [49]
One (M8) [58]
One M9 [59]
Huawei Ascend D2 LTE [60]
Ascend P7 [61]
P8 [49]
P8 Lite 2017
P9 [49]
P9 Lite [49]
Huawei GR 5 2017 [49]
P10 [62]
Kyocera BASIO [54]
DIGNO rafre KYV36 [54]
GRATINA 4G KYF31 [54]
INFOBAR A03 [54] sold under iida brand by "au"
TORQUE G02 [54]
URBANO V01 [54]
URBANO V02 [54]
LG Aristo [63]
Class [48]
Disney Mobile on docomo [52] DM-01G, DM-02H
F60 [48]
G Flex [64]
G Flex 2 [48]
G Pro [60] F240S
G2 [65]
G3 [66]
G4 [55]
G5 [67]
G6 [68]
G7 ThinQ [69]
isai vivid [54] LGV32
isai VL [70] LGV31
K10 [71]
K20 [72]
Lancet [55]
Optimus GX [60] F310L
Optimus LTE 2 [60] F160LV
Optimus LTE III [60] F260S
Optimus Vu II [60] F200L
Spirit LTE Indian Version
Stylo 2 PLUS [73]
Stylus 2 Plus [48]
V10 [48]
V20 [74]
Vu 3 [60] F300
X Screen [48]
Lenovo K5 Note
K6 Power
K6 Note
Z2 Plus
K8
K8 Plus
K8 Note
P2
LYF LYF Earth 1 [75]
LYF Flame 1 [76]
LYF Water 1 [77]
LYF Water 2 [78]
LYF Wind 4S [79]
LYF Wind 6 [80]
Microsoft Lumia 550 [81]
Lumia 640 [81]
Lumia 640 XL [81]
Lumia 650 [81]
Lumia 950 [81]
Lumia 950XL [81]
Motorola Droid Maxx [55]
Droid Maxx 2 [55]
Droid Mini [55]
Droid Turbo [82] XT-1254
Droid Turbo 2 [55]
Moto G (3rd Gen) - XT1550
Moto E3 Power XT1706
Moto G4 Play and Plus XT1643, XT1642, and XT1602
Moto G5 Plus XT1686
Moto Z2 Force [83]
Nokia Nokia 2 [84]
Nokia 3 [85]
Nokia 5 [86]
Nokia 6 [87]
Nokia 6.1 [88]
Nokia 7 [89]
Nokia 7 Plus [90]
Nokia 8 [91]
Nokia 8 Sirocco [92]
OnePlus OnePlus 2 [93]
OnePlus 3/3T [94]
OnePlus 5/5T
OnePlus 6/6T [95]
OnePlus 7
Pantech Vega Iron [60] IM-A870S
Vega N°6 [60] IM-A860S
Vega R3 [60] IM-A850L
Vega Secret Note [60] IM-A890S
Samsung Samsung A01
Galaxy A3 [49][62] 2016 and 2017 model
Galaxy A5 [49][62] 2015, 2016 and 2017 model
Galaxy A7 [48] 2017 model
Galaxy A8 [54] SCV 32
Galaxy A9 Pro [48]
Samsung A10e
Samsung A20
Samsung A50
Samsung A51
Samsung Galaxy A71
Galaxy Active Neo [52] SC-01H
Galaxy Avant [96]
Galaxy Core Prime [55]
Samsung Galaxy Fold
Galaxy Golden [60] SHV-E400
Galaxy Grand [60] SHV-E270
Galaxy J5 [97] SM-J500M, SM-J500FN, SM-J500F
Galaxy J7 [98] SM-J500M, SM-J700FN, SM-J700T, SM-J700P, SM-J700F
Galaxy Light [64]
Galaxy Note II LTE [60] SHV-E250S
Galaxy Note 3 [99]
Galaxy Note 4 [100]
Galaxy Note 5 [101]
Galaxy Note 7 [48]
Samsung Galaxy Note 8 [62]
Samsung Galaxy Note 9
Samsung Galaxy Note 10
Samsung Galaxy Note 10+
Samsung Galaxy Note 10+ 5G
Galaxy Galaxy Note Edge [52] SC-01G
Galaxy Pop [60] SHV-E220S
Galaxy Round [60] SM-G910S
Samsung Galaxy Z Flip
Galaxy S III LTE [60] SHV-E210
Galaxy S4 [60] SCH-R970C
Galaxy S4 mini LTE [102] GT-i9195
Galaxy S4 Zoom [60] SM-C105S
Galaxy S5 [64]
Galaxy S5 Active [52] SC-02G
Galaxy S5 Neo [49] 2016 model
Galaxy S6 [103]
Galaxy S6 Edge [103]
Galaxy S6 Edge+ [104]
Galaxy S7 [105]
Galaxy S7 Active [106]
Galaxy S7 Edge [107]
Galaxy S8 [62]
Galaxy S8+ [62]
Galaxy 8 Active
Galaxy S9
Galaxy S9+
Galaxy S10
Galaxy S10+
Galaxy S10 Lite
Galaxy S10e
Galaxy S10 5G
Galaxy S20 5G
Galaxy S20+ 5G
Galaxy S20 Ultra 5G
Galaxy Win [60] SHV-E500S
Galaxy XCover 4 [62]
Gear S3 [48]
Sharp AQUOS CRYSTAL [53]
AQUOS CRYSTAL 2 [53]
AQUOS CRYSTAL X [53]
AQUOS EVER [52] SH-04G
AQUOS K [54] SHF32, SHF33
AQUOS PAD [52] SH-06F, SH-05G
AQUOS SERIE [54] SHV32, SHV33
AQUOS SERIE mini [54] SHV31, SHV33, SHV38
AQUOS Xx [53]
AQUOS ZETA [52] SH-01G, SH-04F, SH-03G
Disney Mobile on docomo [52] SH-02G
Sony Xperia A4 [52] SO-04G
Xperia M4 Aqua Dual [52] SO-06F
Xperia SP M35t [60]
Xperia X [62]
Xperia X Compact [62]
Xperia X Performance [54] SHV32
Xperia XZ [53]
Xperia XZs [62]
Xperia Z2 [52] SO-03F
Xperia Z2 Tablet [52] SO-05F
Xperia Z3 [52] SO-01G, D6653
Xperia Z3 Compact [52] SO-02G
Xperia Z4 [108] SO-03G
Xperia Z4 Tablet [52] SO-05G
Xperia Z5 [49]
Xperia Z5 Compact [49]
Xperia Z5 Premium [109]
vivo V3 [110]
Vodafone Smart speed 6 [49]
Smart Ultra 6 [49]
Smart Platinum 7 VFD900
Vodafone Smart E8 VFD510
Vodafone Smart Prime 7 VFD600
Vodafone Smart V8 VDF710
Xiaomi Mi5 [111]
Redmi Note 4 [112]
Redmi Note 3
Redmi 3s [113]
Redmi 3s Prime [114]
Mi A3
Mi Max [115]
Mi Mix 2 [115]
Mi 4A [115]
Mi 5A [115]
Mi 9T and 9T Pro (sold as Redmi K20 and K20 Pro in China and India) [115]
Redmi Note 5 [115]

Voice quality

To ensure compatibility, 3GPP demand at least AMR-NB codec (narrow band), but the recommended speech codec for VoLTE is Adaptive Multi-Rate Wideband (AMR-WB), also known as HD Voice. This codec is mandated in 3GPP networks that support 16 kHz sampling.[116] Volte Fraunhofer IIS has proposed and demonstrated "Full-HD Voice", an implementation of the AAC-ELD (Advanced Audio Coding – Enhanced Low Delay) codec for LTE handsets. Where previous cell phone voice codecs only supported frequencies up to 3.5 kHz and upcoming wideband audio services branded as HD Voice up to 7 kHz, Full-HD Voice supports the entire bandwidth range from 20 Hz to 20 kHz. For end-to-end Full-HD Voice calls to succeed however, both the caller and recipient's handsets as well as networks have to support the feature.[117]

The GSMA has nominated the EVS codec for superwideband via VoLTE.[118]

See also

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