It's easy to bring your existing New Zealand mobile number when you join Slingshot Mobile – just follow these steps:

1. Log in to your Slingshot Mobile account.
2. Tap Transfer Your Number in the menu at the top of the page.
3. Fill in the form and tap Confirm transfer.
4. Tap Transfer Your Number in the menu at the top of the page.
5. Wait to receive an SMS asking you to confirm if you want to move your number to another provider.
   
   You must reply YES within 2 hours of receiving the SMS or the transfer will be cancelled and you will need to start the process again from step 3.

From here, your transfer will be completed within 3-4 business hours. You can either leave your old SIM card in your phone until it stops working, or pop your new Slingshot SIM card in right away and use your temporary number until the transfer is complete.