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The Number Change Request stated.
Change of mobile number do allow for porting of another Telco mobile number.
It is Porting + Number Change request done at the same time.
This is NOT to be done separately.
Since porting is to retain number it is also can transfer to another mobile number as in Change Number on existing mobile line.
As porting do not necessary mean to port to another Telco as new subscriber.
What if i do not like the existing pool of number, which is very restricted.
Hence this is by porting another mobile number (from another Telco) to your existing mobile number while contract/plan remain in force, no change.
In short, Change Number from other Telco mobile number instead from the pool available.
All Telco have this option as implemented by IMDA on Porting matter.
Do note it has to be different Telco, not within the same Telco.
If you have 2 mobile lines with the same Telco, the mobile numbers cannot be swap around.
Do note that both Telco mobile lines must be of the SAME Subscriber, else required to Change of ownership.
I am doing this Porting + Change Number for mobile for several times as there is no issue as to by paying for Change of Number fees $32.10 applicable.