I am looking to change my mobile service from Singtel to Starhub, and keep my primary number. So I want to share you my porting process.
Reason for the change if you are wondering - I am changing from Singtel to Starhub, mainly as I am in a new office to Fraser Tower and my 4G coverage for using mobile data is not optimal at the high level my office, when I am looking to tethering internet from my mobile for my laptop to have faster a internet. Note - It is a new building and up quite high, so my SingTel 4G/ 3G signals may be poor as a result of not having enough range of SingTel's current infrastructure in my new area.
So after going through the steps online via starhub.com, then you want to "Select Your Number" step.