During the transfer you can continue to use your current provider's SIM. Once it stops working, that’ll mean your amaysim SIM is in the process of being activated and you'll need to insert your new amaysim SIM card into your device . There may be a short period of service interruption but your service should become active by 8pm on that day.
Once the transfer is complete, your number will be automatically cancelled with your previous provider.
Note: Sometimes account details don't match and transfers can fail. If your transfer has failed, don't panic as we've got a step by step guide on how you can complete the transfer process.