The pre-switching SMS will be sent to your previous SIM card, so make sure that it's active still in your phone. It can take up to ten minutes to arrive. If you're currently on a prepaid plan, you shouldn't need to have any credit to reply to the SMS.
If you're having troubles, please reach out to the felix team in the felix app. We've got humans on chat from 8am to 8pm Sydney time every day and we'd be happy to help.
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