Well, I supposed by now you have heard the news about the government’s new policy that allows every handphone user to port their current number from one telco to another.
I bet the telcos have been facing number limitations since they started to allow users old numbers to be forwarded to their new number. This, then result in a user having more than 2 mobile numbers in their SIM card which prevented the old numbers from being able to circulate to other users or other purposes.
Why not limit to 1 person per mobile number (like the future ipv6 addressing?) so that they can save the resources? Think about it!