If I understand that correctly, you are wanting to display your cellphone screen on your computer monitor.
Usually such programs, if any, are provided by cellphone manufacturers; however there might be some apps for iPhones or Android.
By the way, which phone (make/model) do you have!!!
SR-71: I have the same question about using my computer monitor to replace the screen on my UCH-U640 Samsung cell phone so I can continue to use the phone, by seeing what I am doing since the screen back light died. I just need to see what is going on.
The phone is perfect otherwise. I will use a USB cable to hook the phone to my computer (Windows-7 lap top) 0r a Galaxie tablet. Unless someone tells me to do something else. I just can't keep buying cell phones.
p.s. (Loved the "SR" Blackbird and have seen one up close)