yes, previously, I ported in from Singtel to SIMBA that was 4 months ago, then last week, I ported in from my SIMBA to EIGHT, as SIMBA doesn't refund whatever balance in your credit, make sure you have $0 balance and to maximize your dollar, only port out around 4 or 5 days before the expiry date, I signed up EIGHT online, and select pick up the SIM card.
Once you have picked up the SIM card, you can use it immediately, but still using EIGHT new numbers, then the next day it will change to your existing number. So far the signal is pretty good.