Unknown Number in Cell Phone!!! Help!!!!?

Question

You know when someone calls your cell and it says "Unknown Number?" Is it possible to find out what that number is? How do you find out what the unknown number is?

Please help me!!!

Thanks so much!

Answer 1

Check your monthly bill all numbers are printed out on your bill

Answer 2

call the carrier and ask them what was the number the last incoming call was to your line and they might have it in their system and thell tell you