Turn off One roaming while overseas

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#3436619 22-Nov-2025 12:31

alasta:

I get that a travel eSIM would work well for data, but what about phone calls? Surely you would miss any incoming calls on your NZ number and any outgoing calls would show an unknown foreign phone number on the recipient's caller ID?

Voice over wifi is allowed overseas by One NZ. For iphone and some androids it is very easy to still use VoWifi with a travel esim for data.

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#3436895 22-Nov-2025 22:33

SpartanVXL:

alasta:

I get that a travel eSIM would work well for data, but what about phone calls? Surely you would miss any incoming calls on your NZ number and any outgoing calls would show an unknown foreign phone number on the recipient's caller ID?

Voice over wifi is allowed overseas by One NZ. For iphone and some androids it is very easy to still use VoWifi with a travel esim for data.

That only works if the OneNZ sim is blocked from roaming

Any views expressed on these forums are my own and don't necessarily reflect those of my employer.

alasta

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#3436919 23-Nov-2025 08:14

SpartanVXL:

alasta:

I get that a travel eSIM would work well for data, but what about phone calls? Surely you would miss any incoming calls on your NZ number and any outgoing calls would show an unknown foreign phone number on the recipient's caller ID?

Voice over wifi is allowed overseas by One NZ. For iphone and some androids it is very easy to still use VoWifi with a travel esim for data.

But wouldn't that require you to be within range of a wifi network when making or receiving calls? Or can voice over wifi be somehow redirected over the travel esim?

SpartanVXL

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#3436924 23-Nov-2025 09:10

alasta:

SpartanVXL:

[Voice over wifi is allowed overseas by One NZ. For iphone and some androids it is very easy to still use VoWifi with a travel esim for data.

But wouldn't that require you to be within range of a wifi network when making or receiving calls? Or can voice over wifi be somehow redirected over the travel esim?

Yes it will fallback to the travel eSIM if the phone is not connected to wifi. Set the One NZ sim to manual network selection before you leave the country. When you land it will never connect to a foreign network so you don’t have to worry about roaming charges. As soon as you turn on your travel eSIM you can test vowifi is working with a 2factor sms or getting someone to send you one.

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#3436935 23-Nov-2025 11:26

SpartanVXL:

alasta:

SpartanVXL:

[Voice over wifi is allowed overseas by One NZ. For iphone and some androids it is very easy to still use VoWifi with a travel esim for data.

But wouldn't that require you to be within range of a wifi network when making or receiving calls? Or can voice over wifi be somehow redirected over the travel esim?

Yes it will fallback to the travel eSIM if the phone is not connected to wifi. Set the One NZ sim to manual network selection before you leave the country. When you land it will never connect to a foreign network so you don’t have to worry about roaming charges. As soon as you turn on your travel eSIM you can test vowifi is working with a 2factor sms or getting someone to send you one.

Setting a handset to manual network selection will not stop a handset from attaching to a foreign network

SpartanVXL

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#3436979 23-Nov-2025 14:46

Linux:

Setting a handset to manual network selection will not stop a handset from attaching to a foreign network

Uh.. it definitely does something? You land in the country and there is no One NZ network to connect to and sim status will get stuck on the connecting symbol. I have personally done this on iPhone after reading on how to use vowifi with travel esim, instructions are all over the net for it.

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#3436980 23-Nov-2025 14:48

SpartanVXL:

Linux:

Setting a handset to manual network selection will not stop a handset from attaching to a foreign network

Uh.. it definitely does something? You land in the country and there is no One NZ network to connect to and sim status will get stuck on the connecting symbol. I have personally done this on iPhone after reading on how to use vowifi with travel esim, instructions are all over the net for it.

It will connect to a roaming carrier sooner or later 100%

Asteros

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#3437037 23-Nov-2025 21:05

I was in Sydney last weekend. Before I left NZ, I set my Iphone 15 pro max on iOS 26.1 to manual selection and chose my home network One NZ. Wifi calling was activated in NZ too. I bought a Maya Mobile Esim and correctly activated it at AKL Airport. When I got to Sydney it connected to Optus and very quickly One NZ Wifi Calling via Mobile Data displayed on screen. From then on I could call/receive NZ via wifi calling and send/receive SMS for no roaming charges until I returned to NZ.

So on iOS 26.1, my One NZ SIM manually selected in NZ never connected to a roaming partner for over 48 hours. On previous weeks/months long trips to Asia this was the same.

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#3437065 24-Nov-2025 08:47

SpartanVXL:

Yes it will fallback to the travel eSIM if the phone is not connected to wifi. Set the One NZ sim to manual network selection before you leave the country. When you land it will never connect to a foreign network so you don’t have to worry about roaming charges. As soon as you turn on your travel eSIM you can test vowifi is working with a 2factor sms or getting someone to send you one.

That will work for about 24 hours before the specified network will change back to Automatic... the ONLY way to do this is to have a OneNZ change your plan to block your phone from connecting to a foreign network. Then, it will use the e-sim for VoWifi in all circumstances

Any views expressed on these forums are my own and don't necessarily reflect those of my employer.

nztim

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#3437068 24-Nov-2025 08:53

Asteros:

So on iOS 26.1, my One NZ SIM manually selected in NZ never connected to a roaming partner for over 48 hours. On previous weeks/months long trips to Asia this was the same.

Okay I am happy to be proven wrong but for me this has never worked, maybe IOS 26.1 is different

Any views expressed on these forums are my own and don't necessarily reflect those of my employer.

dafman

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#3437245 24-Nov-2025 19:39

alasta:

I get that a travel eSIM would work well for data, but what about phone calls? Surely you would miss any incoming calls on your NZ number and any outgoing calls would show an unknown foreign phone number on the recipient's caller ID?

Our family & friends know we are travelling and we communicate with them via WhatsApp, FaceTime etc, so it’s only unexpected incoming phone calls that are impacted. Do we want to pay $5+ extra a day just to receive these? No. These are extremely rare anyway. YMMV

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#3437254 24-Nov-2025 20:15

nztim:

Asteros:

So on iOS 26.1, my One NZ SIM manually selected in NZ never connected to a roaming partner for over 48 hours. On previous weeks/months long trips to Asia this was the same.

Okay I am happy to be proven wrong but for me this has never worked, maybe IOS 26.1 is different

it has worked for me in iOS 17 and 18 and now iOS 26. Before then I didn’t know about using mobile data like this so didn’t try.

Asteros

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#3437311 24-Nov-2025 22:33

I forgot to add that I turned on Mobile Data Switching in Settings - Mobile Data. iOS will automatically use the data from the Travel eSim I bought for VoWifi and SMS on the One NZ eSIM. Turning off Automatic network selection and locking it to One NZ in AKL before I left NZ has worked to not join a foreign network until I returned to NZ for many trips even multi-months in length since I first tried using it in iOS17.

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#3438425 29-Nov-2025 10:45

I spent six weeks in Oz, and turned off the OneNZ SIM.

Bought an Optus Oz SIM, and selected that for entire stay (I think it was around AU$15 for unlimited calls & texts for 28 days).

No OneNZ roaming charges.

lurker

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#3438433 29-Nov-2025 11:08

My wife and I just returned from Australia. I left my phone to roam, put hers in airplane mode. Then ran a hotspot for her to connect for wifi calling/text

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