Hi @Wynterraven, you'll need to chat with our customer care team on → 1300555002. You'll need to request a SIM upgrade. They''ll be able to modify your current Coles prepaid plan and pop you onto one of our current Optus prepaid offers. You will not lose your mobile number in the process. If you do run into any difficulty let us know and we'll gladly help out. We also have a live chat service that's available 24/7 → http://yesopt.us/chat2us.