Porting Landline Number to New a SIM Card

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Tandem

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#324131 3-Mar-2026 15:12

Getting a new SIM Card for a new mobile phone and would like to port an existing landline number to the new SIM.

What are the correct steps for this?

Most mobile provider websites only mention porting mobile numbers between providers.

Thank you for your time.

MaxineN

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#3466486 3-Mar-2026 15:48

You need LNOM, or Local Number on Mobile (in the sense that you want it).

This is a business level feature that is normally taken care of by the gaining provider on a business plan that offers it.

The alternative is porting the number to a VoIP provider and then using your phone to register it against the SIP provider. You will need mobile data of course if not on WiFi. Hero is an example of one provider that can do this (also via an app). You do have to pay to keep the landline up, receive looks to be free but ringing out is not.

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nztim

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#3466492 3-Mar-2026 16:00

Correct, business only mobile plans.

04 09 03 07 numbers can only be ported to other landline providers

likewise, you can't port a mobile number to a landline

Hero is your best option to make/receive calls with your landline number on your mobile phone

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

Tandem

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#3466496 3-Mar-2026 16:31

Thanks for the replies.

Just out of curiosity, is the reason for this limitation of technical or legislative nature?

I did not find any mention of this in the Number Portability regulation.

Considering the copper withdrawal and the PSTN switch-off is already in progress, would it not make sense for people to be able to port their landline numbers to any of the other service options available?

Are they just throwing away all the 03 04 07 09 numbers? Why not reuse them?

There was a mention on this forum where someone ported a landline number to basic wireless SIM, how is that different?

richms

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#3466500 3-Mar-2026 16:35

There is a lot of legacy BS with landline numbers. The continued enforcement of calling areas in an IP world is absurd. Can't take a number from a spark connected ONT in one area slightly north of auckland to a new subdivisions one because its over some imaginary line on someones map. Other telcos do not give a crap about that and allow it to happen.

Then if the neighbours who happen to have a landline from spark want to call them, it will end up costing. Again, legacy numbering carryon that should have been deleted 10+ years ago.

Richard rich.ms

RunningMan

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#3466556 3-Mar-2026 17:22

Tandem:

There was a mention on this forum where someone ported a landline number to basic wireless SIM, how is that different?

It's not ported to the SIM, it's ported to Spark's voice platform and delivered as VoIP to the ATA in the supplied modem.

nztim

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#3466609 4-Mar-2026 08:44

richms:

There is a lot of legacy BS with landline numbers. The continued enforcement of calling areas in an IP world is absurd. Can't take a number from a spark connected ONT in one area slightly north of auckland to a new subdivisions one because its over some imaginary line on someones map. Other telcos do not give a crap about that and allow it to happen.

Then if the neighbours who happen to have a landline from spark want to call them, it will end up costing. Again, legacy numbering carryon that should have been deleted 10+ years ago.

These problems disappear when the last NEAX 2028 & 3G shutdown 2026 then everything will be IP

Calls between the last NEAX & 3G lines and the rest of the IP world still require costly SS7 to SIP conversion

Agree an IP to IP calls which is made over SIP should not cost anything.

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nztim

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#3466611 4-Mar-2026 08:48

Tandem:

Considering the copper withdrawal and the PSTN switch-off is already in progress, would it not make sense for people to be able to port their landline numbers to any of the other service options available?

They can be ported to Any other Landline Provider

It is a privilege of a Business Mobile Plan to have the Landline number terminated directly onto a Mobile.

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saf

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#3466659 4-Mar-2026 10:20

Tandem:

Just out of curiosity, is the reason for this limitation of technical or legislative nature?

I did not find any mention of this in the Number Portability regulation.

Refer to the ITU NZ Numbering Plan, and NAD Rules (page 19 gives a good visual representation).

Quite clear the differentiating area codes between non-geographic and geographic numbers.

This is why you see some geographic/local numbers deployed onto fixed wireless modems, as that is a geographic service (or... supposed to be...), whereas a mobile device gets a non-geographic/mobile number, which can have a LNOM geographic number forwarded to it.

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richms

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#3466664 4-Mar-2026 10:41

How much of the kiwishare rules are still in place that limit these changes? I know that was the reason that they have to subdivide auckland into multiple areas back when this last raised its head.

Richard rich.ms

nztim

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#3466677 4-Mar-2026 11:25

saf:

whereas a mobile device gets a non-geographic/mobile number, which can have a LNOM geographic number forwarded to it.

Your demonstration above is why even when a LL number is attached to a mobile on a business plan outbound calls always present the mobile number

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yitz

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#3466699 4-Mar-2026 13:34

Last time it was possible with Woosh Wireless and Vodafone had their Home Phone Wireless but neither exist any longer.

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nztim

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#3466934 5-Mar-2026 09:39

yitz:

Last time it was possible with Woosh Wireless and Vodafone had their Home Phone Wireless but neither exist any longer.

Woosh still placed your number your landline onto their SBC and a local ATA adapter SIP registered to it with a regular handset connected to it.

Likewise One/Vodafone has a 4G/5G/Fibre/DSL Modem with a built in ATA adapter with a normal phone plugged in and SIP registered to their SBC

NO mobile phone provider has EVER had a landline number ported to it for inbound/outbound calls, only business plans have a landline number forwarded to their mobile, and when a call is placed the mobile number is presented as caller id not the landline number.

OP port your line to Hero and get the hero app on your mobile phone, all for a grand total of less than $5 per month.

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yitz

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#3466983 5-Mar-2026 12:35

nztim:

OP port your line to Hero and get the hero app on your mobile phone, all for a grand total of less than $5 per month.

How reliable is that though? I'm surprised there aren't any recent threads with peoples experiences on this. Most existing threads are over a decade old.

Maybe VoLTE needs to be regulated/unbundled to work the same way the ONT voice port does on UFB.

toejam316

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#3466990 5-Mar-2026 13:24

It's so reliable that it just works and no one needs to make threads discussing it. VoIP is a pretty well solved problem in this day and age, and setting up a VoIP provider with call forwarding is pretty much bullet proof, as far as service providers go.

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nztim

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#3466991 5-Mar-2026 13:30

toejam316:

It's so reliable that it just works and no one needs to make threads discussing it. VoIP is a pretty well solved problem in this day and age, and setting up a VoIP provider with call forwarding is pretty much bullet proof, as far as service providers go.

And making and receiving calls the with the hero app over4G/5G data is no different to a VoLTE call

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