need to get number off dropped/broken phone

i dropped my phone today its a samsung something.. lol nothing special just a regular phone. but the screen is white, at first i could still make calls and stuff but just couldnt see the screen. now it doesnt do anything except when i plug in the charger the screen turns white but i cant do do anything.. doesnt help that i cant tell if the phone is on or off or whats going on.
i could care less about the phone. i just really need to get a number off of there.. do if i could just get the screen to work for a couple mins thats all i need.. anyone have any advice?? its pretty urgent..
btw i have at&t. and the the number isnt saved to my sim card, only to the phone...
help please!!

 

Have you called AT&T. They might be able to plug it in and get the info off.

 

idk if the screen is broken it isnt cracked or anything. just white. and like i said i the only thing it does now is turn white when i plug it in. cant get it to do anything else.
so at&t can pull the number outta the phone memory?