Man talking on a mobile phone, VoLTE.

About VoLTE

Voice calling on mobile data networks and VoLTE roaming.

VoLTE technology - voice calling over 4G and 5G

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.

5. To use 4G Calling while roaming, you need to ensure you are on an eligible One NZ Pay Monthly plan. All of our current in-market plans include VoLTE roaming.

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 / 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

• iPhone 14 Pro

iPhone 14 Pro Max

• iPhone 14

• iPhone 14 Plus

• 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 XS Max

• iPhone XS

• iPhone XR

iPhone SE (3rd Generation)

• iPhone SE

• iPhone X

• iPhone 8 Plus

• iPhone 8

• iPhone 7 Plus

• iPhone 7

• iPhone 6S

• iPhone 6S Plus

• iPhone 6

• iPhone 6 Plus

• iPhone SE (2nd Generation)


    VoLTE and VoLTE roaming enabledVoLTE, but not VoLTE roaming enabled
    • Galaxy A02s
    • Galaxy A03
    • Galaxy A03s
    Galaxy A04
    • Galaxy A11
    • Galaxy A12 4G
    • Galaxy A13
    Galaxy A14 4G
    • Galaxy A21s
    • Galaxy A22 4G
    • Galaxy A22 5G
    • Galaxy A23
    • Galaxy A24 4G
    • Galaxy A31
    • Galaxy A32 4G
    • Galaxy A32 5G
    • Galaxy A33
    Galaxy A34
    • Galaxy A51
    • 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 4G
    • Galaxy Note20 Ultra 5G
    • Galaxy S20
    • Galaxy S20 FE 4G
    • Galaxy S20 Ultra
    • Galaxy S20+ 4G
    • 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 Tab A8
    • 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 Xcover 5
    • Galaxy Xcover Pro
    • Galaxy Xcover6 Pro
    • 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
    • Galaxy A01
    • Galaxy A01 Core
    • Galaxy A10
    Galaxy A14 5G
    • Galaxy A20
    • Galaxy A30
    • Galaxy A50
    • Galaxy A70
    • Galaxy A8
    • Galaxy J5 Pro
    • Galaxy J6
    • Galaxy Note10
    • Galaxy Note10+ 4G
    • Galaxy Note10+ 5G
    • Galaxy Note8
    • Galaxy Note9
    • Galaxy S10
    • Galaxy S10+
    • Galaxy S10e
    • Galaxy S9
    • Galaxy S9+
    • Galaxy Tab A7 Lite
    • Galaxy Xcover 4s


    VoLTE and VoLTE roaming enabledVoLTE, but not VoLTE roaming enabled
    • A54
    • A74
    • A77
    • Find N2 Flip 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
    • A57s
    • A72

    One NZ

    VoLTE and VoLTE roaming enabledVoLTE, but not VoLTE roaming enabled
    Smart E10
    • Smart P11 4G
    Smart P12
    • Smart V11 4G
    • Smart V12 4G
    • B525
    • Smart E11
    • Smart E9 16Gb
    Smart Green
    • Smart N10
    • Smart N11
    Smart N12
    Smart T23
    Smart V22
    • 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. Customers will see “VoLTE” at the top of their screen.

    Is VoLTE the same as HD Voice?

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

    HD Voice is also known as Wideband audio. HD Voice works by extending the frequency range of the sound transmitted for phone calls.

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