Helllp! plz hurry!!! if you own a blackberry!!!?

okay so i found thid blackberry on the side of the road and i callled some ppl cuz i was messin around cuz ya know imma kid and i found a fone wha hoo! but anyway the screen is blank but the keys work so i was wonderin how you get to the contacts so i could call them and let them know i found it if you own a blackberry plz help!!! i dont know wat kind it says sprint at the bottom plzz hurry!!! thanks!! so much