Man talking on a mobile phone, VoLTE.

About VoLTE

Voice calling on mobile data networks.

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, and on our 5G network.

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.

Key benefits of the Voice over Long-Term Evolution (VoLTE) upgrade, otherwise known as '4G Calling', includes reduced background noise on voice calls and quicker call connection.

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.

What VoLTE technology means for you.

Using VoLTE means you'll experience crystal clear audio on your calls and better connectivity. And VoLTE supports 4G to 3G handover to ensure call continuity and a smooth experience.

How to get enabled for 4G Calling:

  • First of all, 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.
  • Next, check whether your phone supports VoLTE. 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.
  • Next, you'll need to update your firmware. You can prompt this update yourself.
  • Finally, you need to enable VoLTE in your phone settings.

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.
RBI2 sites are designed to support 4G Calling as they are switched on.

VoLTE capable phones and devices

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




  • Galaxy A01
  • Galaxy A01 Core
  • Galaxy A02s
  • Galaxy A03
  • Galaxy A03s
  • Galaxy A04
  • Galaxy A10
  • Galaxy A11
  • Galaxy A12 4G
  • Galaxy A12 5G
  • Galaxy A13
  • Galaxy A14 4G
  • Galaxy A14 5G
  • Galaxy A20
  • Galaxy A21s
  • Galaxy A22 4G
  • Galaxy A22 5G
  • Galaxy A23
  • Galaxy A30
  • Galaxy A31
  • Galaxy A32 4G
  • Galaxy A32 5G
  • Galaxy A33
  • Galaxy A34
  • Galaxy A50
  • Galaxy A51
  • Galaxy A52
  • Galaxy A53
  • Galaxy A54
  • Galaxy A70
  • Galaxy A71
  • Galaxy A72
  • Galaxy A73
  • Galaxy A8
  • Galaxy A80
  • Galaxy A90 5G
  • Galaxy J5 Pro
  • Galaxy J6
  • Galaxy Note10
  • Galaxy Note10+ 4G
  • Galaxy Note10+ 5G
  • Galaxy Note20 4G
  • Galaxy Note20 5G
  • Galaxy Note20 Ultra 4G
  • Galaxy Note20 Ultra 5G
  • Galaxy Note8
  • Galaxy Note9
  • Galaxy S10
  • Galaxy S10+
  • Galaxy S10e
  • Galaxy S20
  • Galaxy S20 FE 4G
  • Galaxy S20 FE 5G
  • 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 S9
  • Galaxy S9+
  • Galaxy Tab A7 Lite
  • 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 Xcover4s
  • Galaxy Xcover6 Pro
  • Galaxy Z Flip
  • Galaxy Z Flip 5G
  • Galaxy Z Flip3
  • Galaxy Z Flip4 5G
  • Galaxy Z Fold 4G
  • Galaxy Z Fold2 5G
  • Galaxy Z Fold3
  • Galaxy Z Fold4 5G



  • B818
  • H122
  • Nova 5T
  • P20
  • P20 Pro
  • P30
  • P30 Pro


One NZ

TP-Link Deco

  • 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?

Currently, iPhone users will need to switch VoLTE on manually. To do this, look under Settings > Mobile > Mobile Data Options > Enable 4G Voice and Data.

For Samsung handset users, VoLTE is set to be default on for VoLTE capable devices, so customers with an S9 or S10 will see “VoLTE” on 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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