Just received this, trying to get more details:
Also available from today customers with an iPhone XR, iPhone XS or iPhone XS Max can now make use of dual SIM, allowing them to add a second phone line and use both numbers on one iPhone.
Activation for new customers is done simply via a QR code, while existing eligible customers can visit a Spark store to transfer their current mobile number and plan to the eSIM, - freeing up the physical Nano-SIM for another number or plan
For further details and list of compatible eSIM devices please visit www.spark.co.nz/esim