I just found this blog, which this author said he didn't get it either in the beginning, but with the fourth rep (wow!), he finally got it, and it was quite simple and straight forward. Yes, he even researched on HoFo here before too, and got no methods.
So if it could be done by a rep by cancelling the SIM and then requesting a port in, and then (push?) through to the same SIM again, how come nobody knew about it on HoFo? Aren't some of you are the experts here? Or that rep did something that he is not supposed to, but works?
No longer on a leash by Fido