You're quickly becoming a popular fellow in our community .
Unfortunately, that is correct, it is not a supported feature. With that said, I believe it'll only function if you are currently on a non Rogers network. In other words, you'll have to be roaming in order for it to work.
I may be mistaken, so I'll try and gather more information and get back to you soon as I can verify my hunch.
Thanks for the kind words, but look at my avatar. I did wireline though, not GSM. GSM has no features. I think you would dial *351*password# and then hit SEND on your home network to disable incoming calls while roaming. To turn it off, #351# and SEND.
We had MADN MCR or SCR I think when DMS-100 (wireline switch) and DMS-MTX (cellular switch) talked to each other. That was when CDMA ruled. That's where your landline and cell ring at the same time on a single number, and you can pick up on either, and when you do, the other phone stops ringing. You could also pass the call back and forth between the two. I remember doing that on BCM using FMFM (Find Me Follow Me). If it was MCR, a 2nd call would ring the landline if you answered the cell and were still talking, and vice-versa.
So, cellular is kinda primitive for me. No talking call waiting, selective call rejection, call intercept, camp on -- nuthin'.