I would like to transfer a call (mid-call) to another number. Is it possible?
I do this all the time by pushing ## ...it tells me I am transferring the number and then I put in the number to route to... only, it has do be done within 20 seconds or you have to start over and push ## again
The final step is done by the phone... you wait until it disconnects you
This works on my iPhone X with ATT family plan