Man talking on a mobile phone, using VoLTE.

About VoLTE and VoLTE roaming

Voice calling on mobile data networks

VoLTE technology - voice calling over 4G and 5G

The thing you'll notice when you start using a VoLTE capable phone is the amazing clear call quality.

Understanding VoLTE

VoLTE stands for 'Voice over Long Term Evolution', which is part of mobile high-speed wireless communication standards. That means voice calls will work on 4G networks (domestic and roaming), and on our 5G network (domestic).

Up until recently, voice calls would connect over 2G and 3G networks, while 4G has typically been used for data transmission. Enabling 4G Calling calls means better connectivity for the mobile network and, more importantly, better capacity.

One NZ will, of course, continue to support voice calls over 3G and 2G, for devices that are not 4G capable - and if your phone call is made outside a 4G coverage area.

VoLTE technology is a core part of the 5G standard, and voice calling will continue to be provided over 4G using VoLTE.
VoLTE roaming lets you make VoLTE calls when roaming to another network operator that supports VoLTE calling.

What VoLTE technology means for you.

Using VoLTE means you’ll experience crystal clear audio on your calls (reduced background noise) and a quicker call connection. VoLTE supports 4G to 3G handover to ensure call continuity and a smooth experience. This also means less disruption when downloading content and simultaneously receiving calls.

How to get enabled for 4G Calling:

1. Check whether you are within a 4G Calling/VoLTE coverage area, using our 4G coverage map. One NZ will continue to roll out VoLTE, so if you are not within coverage yet, keep checking. As of August 2023, we have started rolling out VoLTE coverage in certain roaming destinations with some of our partner networks, which will expand over time.

2. Check whether your phone supports VoLTE and/or VoLTE roaming. A list of supported devices is below.

  • For iPhone users, that includes models from iPhone 6 and newer, all the way up to iPhone 14.
  • For Android users, that includes phones like Galaxy S9 and newer.

3. You need to ensure your firmware is updated. If needed, you can prompt this update yourself.

4. You need to ensure VoLTE is enabled in your device settings. Once VoLTE is enabled, if your device is also VOLTE Roaming capable (outlined in below list), this will be automatically enabled.

Note: if still can’t connect to VoLTE, try turning your phone on and off again near the mobile cell site. Otherwise your SIM may need to be enabled for VoLTE, so contact us to get this sorted.

Where VoLTE is available today.

One NZ's 4G Calling deployment is now live across New Zealand. The first area to benefit from 4G Calling was Auckland’s North Shore in June 2019, and we now have finished our nationwide upgrade program.
In Rural Broadband areas, RBI2 sites are designed to support 4G Calling as they are switched on.

VoLTE while roaming

As of August 2023, we have started to deploy VOLTE with some of our overseas roaming partners, but this is only possible if and where VoLTE is available within the roaming partner network coverage. This will enable you to experience the enhanced VoLTE quality while you roam in more and more of our roaming destinations, as long as you have a VoLTE roaming capable phone, and the corresponding settings and software update (see above steps).

Please note that not all VoLTE capable phones, which connect to 4G networks while in NZ, are also VoLTE roaming enabled. Some of the more popular phone models that are not VoLTE Roaming enabled are iPhone 7s, 8s, Xs, Samsung A10s, Galaxy S9s. Please check your phone model in the list below.

2G/3G roaming shutdown

All our roaming partners in the US, Australia, Taiwan and Singapore are shutting down their 2G / 3G networks in 2024, with more coming in the following years. This means that if you do not have a VoLTE roaming enabled phone, you will no longer be able to make or receive calls or TXTs in these destinations.

VoLTE / VoLTE roaming capable devices

One NZ supports a range of VoLTE and VoLTE roaming capable devices, including these:

Alcatel

VoLTE and VoLTE roaming enabled

Apple

VoLTE and VoLTE roaming enabled.VoLTE, but not VoLTE roaming enabled.
iPhone 15 Pro MaxiPhone X
iPhone 15 ProiPhone 8 Plus
iPhone 15 PlusiPhone 8
iPhone 15iPhone 7 Plus
iPhone 14 ProiPhone 7
iPhone 14 Pro MaxiPhone 6
iPhone 14iPhone 6 Plus
iPhone 14 PlusiPhone SE (1st Generation)
iPhone 13 Pro
iPhone 13 Pro Max
iPhone 13
iPhone 13 mini
iPhone 12 Pro
iPhone 12 Pro Max
iPhone 12
iPhone 12 mini
iPhone 11 Pro
iPhone 11 Pro Max
iPhone 11
iPhone 6S
iPhone 6S Plus
iPhone XS Max
iPhone XS
iPhone XR
iPhone SE (3rd Generation)
iPhone SE (2nd Generation)

    Samsung

    VoLTE and VoLTE roaming enabledVoLTE, but not VoLTE roaming enabled
    Galaxy A02sGalaxy A01
    Galaxy A03 Galaxy A01 Core
    Galaxy A03s Galaxy A10
    Galaxy A04Galaxy A14 5G
    Galaxy A05 4GGalaxy A20
    Galaxy A05s 4GGalaxy A30
    Galaxy A11Galaxy A50
    Galaxy A12 4GGalaxy A70
    Galaxy A13Galaxy A8
    Galaxy A14 4GGalaxy J5 Pro
    Galaxy A15 5GGalaxy J6
    Galaxy A21sGalaxy Note10+ 5G
    Galaxy A23Galaxy Note8
    Galaxy A24 4GGalaxy Note9
    Galaxy A25 5GGalaxy S10
    Galaxy A31Galaxy S10+
    Galaxy A32 4GGalaxy S10e
    Galaxy A32 5G Galaxy S9
    Galaxy A33Galaxy S9+
    Galaxy A34Galaxy Tab A7 Lite
    Galaxy A51Galaxy Xcover 4s
    Galaxy A52
    Galaxy A53
    Galaxy A54
    Galaxy A71
    Galaxy A72
    Galaxy A73
    Galaxy A80
    Galaxy A90 5G
    Galaxy Note20 4G
    Galaxy Note20 5G
    Galaxy Note20 Ultra 4
    Galaxy Note20 Ultra 5G
    Galaxy S20
    Galaxy S20 FE 4G
    Galaxy S20 Ultra
    Galaxy S20+ 4G
    Galaxy S20+ 5G
    Galaxy S21
    Galaxy S21 FE
    Galaxy S21 Ultra
    Galaxy S21+
    Galaxy S22
    Galaxy S22 Ultra
    Galaxy S22+
    Galaxy S23
    Galaxy S23+
    Galaxy S23 Ultra
    Galaxy S23 FE 5G
    Galaxy S24 5G
    Galaxy S24 Ultra 5G
    Galaxy S24+ 5G
    Galaxy Tab A8
    Galaxy Tab A9 4G
    Galaxy Tab Active 3
    Galaxy Tab Active 4 Pro
    Galaxy Tab S7 - 2020
    Galaxy Tab S7+ 2020
    Galaxy Tab S8
    Galaxy Tab S8 Ultra
    Galaxy Tab S8+
    Galaxy Tab S9 FE 128GB 5G
    Galaxy Tab S9 FE+ 128GB 5G
    Galaxy Xcover 5
    Galaxy Xcover Pro
    Galaxy Xcover6 Pro
    Galaxy Xcover7
    Galaxy Z Flip
    Galaxy Z Flip 5G
    Galaxy Z Flip3
    Galaxy Z Flip4 5G
    Galaxy Z Flip 5
    Galaxy Z Fold 4G
    Galaxy Z Fold2 5G
    Galaxy Z Fold3
    Galaxy Z Fold4 5G
    Galaxy Z Fold 5

    OPPO

    VoLTE and VoLTE roaming enabledVoLTE, but not VoLTE roaming enabled
    A38

    • A54

    A58

    • A57s

    • A74

    • A77

    A78

    • Find N2 Flip 5G

    Find N3 Fold 5G

    • Find X2 Lite

    • Find X2 Pro

    • Find X3 Lite

    • Find X3 Pro

    • Find X5

    • Find X5 Lite

    • Find X5 Pro

    Reno8 Lite

    Reno10 Pro 5G

    Reno10 5G
    • A53s

    • A72

    One NZ

    VoLTE and VoLTE roaming enabledVoLTE, but not VoLTE roaming enabled
    Smart E10

    Smart Green

    • Smart M23 Locked 4G

    • Smart P11 4G

    • Smart P12

    Smart P24

    • Smart V11 4G

    • Smart V12 4G

    Smart V22
    • B525

    • Smart E11

    • Smart E9 16Gb

    • Smart N10

    • Smart N11

    Smart N12

    • Smart T23

    • Smart X9

    Huawei

    VoLTE, but not VoLTE roaming enabled
    • B818
    • H122
    • Nova 5T
    • P20
    • P20 Pro
    • P30
    • P30 Pro

    MobiWire

    VoLTE, but not VoLTE roaming enabled
    • MobiWire Hinto
    • MobiWire Ogima

    TP-Link Deco

    VoLTE, but not VoLTE roaming enabled
    • X80-5G

    Recently supplied B525 modems will receive a firmware upgrade over the network, with no intervention required by customers.

    If your phone was not purchased from One NZ New Zealand (for example via another network operator, parallel importer or overseas) it may not work correctly or have partial VoLTE functionality on the One NZ New Zealand network.

    Frequently asked questions

    Is VoLTE enabled by default?

    Older iPhone models may need to have VoLTE switched on manually. To do this, look under Settings>Mobile>Mobile Data Options>Enable 4G Voice and Data. Newer models have VoLTE enabled by default.

    For Samsung handset users, VoLTE is set to be on by default for VoLTE capable devices. Customers will see “VoLTE” at the top of their screen.

    Is VoLTE the same as HD Voice?

    VoLTE is a newer standard, that incorporates the HD Voice standard, specifically using the AMR-WB audio codec. While it's technically different, Voice over LTE (VoLTE) also provides crystal clear calling, delivered over 4G and 5G.

    HD Voice is also known as Wideband audio, and sometimes called 'advanced calling'. HD Voice works by extending the frequency range of the sound transmitted for phone calls.

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