Dial the numbers one by one and check if the name will be retrieved from your phone book.
NB: Make sure you are not in a tall building, near a highway or anywhere near knives, pangas or anything that might be considered as a weapon. You might dial the one that reads
"Me I must get it from our tea boy at work juu ni msupuu, a mechanic who operates in the plot next to jobo and a neighbors son when he's on holiday. Na bado mzee wangu kant notice." only for the screen to read "wifey", "sweetheart", "Baby" etc.
Never count on making a good sale. Have the purchase price be so attractive that even a mediocre sale gives good returns.