This number has been ported a few time. Before zero 1, the number is from Starhub. You have posted a good question about OTP vs normal sms. Since OTP security is more important than normal sms, may be it will pass through some extra encryption before reaching me.
Can anyone share some light
i found this process overview of number porting from the imda website :
Full Mobile Number Portability is a solution that allows consumers to keep one mobile number for life, even when they switch operators. It works via a central database system in a multi-operator environment, in which all ported mobile subscribers’ numbers and routing information are kept. When a call/SMS/MMS is made to a ported mobile subscriber under the solution, the caller’s mobile operator will check against the central database information and route the call/SMS/MMS directly to the ported subscriber’s new operator.
basically 3 steps :
1. sending/calling operator to check central database
2. central database maintained by a central clearinghouse
3. sending/calling operator to route to the receiver number's operator
if the above is true, looks like your problem has nothing to do with MR ? it is the OTP service provider's telco operator's job to do all the work.
looks like these processes are vulnerable and not robust at all, what happened to all the handshaking protocols between operators ? by the way, i am just a layman. haha.
