Wow! Its been a while since ive thought abt that....
I'm actually loving it, I used to set up call forwarding for my smartphone to forward to my dumb phone via the smartphone settings and I would wait 4-5 minutes untill I would get it to work.
It just didn't make any sense to do it that way, so googled short codes and bam, just what I was looking for. I know it exists for most carrier's out there, I'm like TMobile has to offer that feature as well.
Was dial **21*1(7181234567)#
Obviously put your own number in the bracket's. And IINM dial ##21#1 to disable call forwarding. And that works under 20 Seconds. A real bummer from the way I was doing it.