Miss one of those frequency changes or an altitude call and you will find out how important ATC and your employer think communication is. Yet we commonly use our flight numbers as callsigns. Many flight numbers are chosen for commercial purposes, with no consideration for on-air suitability. For example, one airline I flew with had something like 8332 and 8832 scheduled in the same area at the same time.
Sorry to be off topic a bit, but this nearly resulted in a collision, and I have difficulty in understanding why the asian_ company was not interested.