make sure that your phone is UNLOCKED from the Optus network.
Grab a starter kit and contact Boost 1258881 or Live Chat.
make sure that you DO NOT ACTIVATE THE STARTER KIT
If your account from Optus is Postpaid make sure the account number is with you.
If your account from Optus is Prepaid make sure that the details of the DOB is the same with what they have.
Porting will always take 24 - 48 business hours but will depend on how quickly they will release the number as well.
No, essentially if the SIM card is already activated it will already have a mobile number associated and as such can't be used for porting.