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 4G and 5G mobile network communication standards. If you have a VoLTE-capable phone, voice calls will work on 4G and 5G networks here in NZ. 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.

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.

1. Check you are within 4G and 5G network coverage using our mobile coverage maps
One NZ will continue to roll out more coverage over time, so if you are not within coverage yet, keep checking.

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

• For iPhone users, VoLTE is supported on all models from iPhone 6 onwards
• For Android users, VoLTE is supported on many phones as shown below

VoLTE/VoLTE roaming capable devices

3. Ensure that your phone software (e.g. iOS for Apple or Android for Samsung) is up-to-date
If needed, you can prompt this update yourself in your phone settings.

4. Ensure that your phone settings are enabled for 4G/5G data and/or VoLTE
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 and 5G voice calling anywhere in New Zealand that offers 4G or 5G coverage.

VoLTE while roaming overseas
VoLTE roaming is becoming the main way to make voice calls while travelling overseas and we are enabling this with an increasing number of our roaming partners. This will let you experience enhanced VoLTE quality while travelling overseas. However, you will need to check the phone list below to ensure that your phone supports VoLTE roaming in addition to VoLTE. Most phones do but there are a few exceptions as noted.

Please note that even if your phone doesn’t work for VoLTE roaming while overseas, you will still be able to use 4G data and text.

2G/3G roaming shutdown and VoLTE roaming
Many overseas networks have already shut down their 2G/3G networks and many more will do so in the near future. All 3G networks in the U.S. and Taiwan have already shutdown with Australia and Singapore doing this soon. This means that you must have a VoLTE roaming-enabled phone to make or receive 4G/5G calls in these destinations.

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

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