When signing up for a postpaid mobile plan at Singtelshop.com or at any Singtel Shop, you can opt to retain your existing mobile number when prompted to choose a number.
You may experience a service disruption on the day of the port-in, however Singtel will try to minimize the inconvenience by only provisioning the port-in during off-peak hours. An SMS notification will be sent to inform you of the date of your port-in.