Man talking on a mobile phone, using VoLTE.

About Voice over LTE and VoLTE roaming

Voice calling over mobile data networks.

VoLTE technology - voice calling over 4G and 5G

When you start using a VoLTE-capable phone, you'll notice the amazing clear call quality, fewer dropped calls and the quick call setup time.

Understanding VoLTE
VoLTE stands for 'Voice over Long Term Evolution', which is part of mobile high-speed wireless communication standards. If you have a VoLTE-capable phone, voice calls will work on 4G and 5G networks here in NZ and on overseas networks, too.

Until recently, voice calls were made over 2G and 3G networks, with 4G typically used for data transmission. Enabling 4G voice-calling means better connectivity to the mobile network and much clearer call quality.

VoLTE technology is a core part of the 4G and 5G standards and will continue to be used well into the future.

VoLTE roaming lets you make VoLTE calls when roaming to another network operator that also supports VoLTE calling.

What VoLTE technology means for you.
VoLTE works over 4G and 5G to ensure call continuity and a smooth experience. You'll experience crystal-clear sound on calls (reduced background noise) and a quicker call connection and fewer dropped calls. There'll also be less disruption when you simultaneously download content, browse social media and receive calls.
Seamless handover to 3G is also supported until March 2025.

How to get enabled for 4G Calling

  1. Check whether you are within 4G voice calling/VoLTE coverage, using our 4G coverage map. One NZ will continue to roll out advanced coverage over time, so if you are not within coverage yet, keep checking. VoLTE roaming is already enabled in certain destinations, and this coverage will continue to expand over time.
  2. Check whether your phone supports VoLTE and/or VoLTE roaming. A list of devices supported in New Zealand is below (NB. A small number of these models will work in NZ but will not work when roaming).
    • For iPhone users, VoLTE is supported on models from iPhone 6 and newer, all the way up to iPhone 15.
    • For Android users, VoLTE is supported on phones like Galaxy S9 and newer.
    • See the full list of VoLTE compatible devices below.
  3. Ensure that your phone firmware is up-to-date. If needed, you can prompt this update yourself in your phone settings.
  4. Ensure VoLTE is enabled in your phone settings. Once VoLTE is enabled, if your device is also VOLTE Roaming capable (outlined in below list), this will be automatically enabled.

Note: If you still can’t connect to VoLTE, try turning your phone on and off again while in an area with good mobile coverage. In some instances, your SIM may need to be enabled for VoLTE, so please contact us for support if this applies to you.

Where VoLTE is available today.
One NZ customers can access 4G voice calling anywhere in New Zealand that offers 4G or 5G coverage.

VoLTE while roaming.
VoLTE roaming is already enabled with some of our overseas roaming partners, so you can experience enhanced VoLTE quality while overseas, 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 capable.
VoLTE roaming is not enabled by iPhone 7, iPhone 8, iPhone X, Samsung S9 and S10, and Note 8, 9 and 10.
You can check compatibility of your phone model in the list below.

One NZ’s 3G network shutdown.
We have announced the future shutdown of our 3G network. See the 3G network shutdown details here.

2G/3G roaming shutdown and VoLTE roaming.
Many overseas operators, including some of our international roaming partners, have already shut down or started shutting down their 2G/3G networks. Roaming partners in Australia, the United States, Taiwan, and Singapore have already done so, with more to follow in the next few years. This means you will need a VoLTE roaming-enabled phone 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:


VoLTE and VoLTE roaming enabled


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)


    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


    VoLTE and VoLTE roaming enabledVoLTE, but not VoLTE roaming enabled

    • A54


    • A57s

    • A74

    • A77


    • 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


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


    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. You will see “VoLTE” shown at the top of their screen when it is available.

    Is VoLTE the same as HD Voice?

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

    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.

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