How do you block someone on your phone

You need to contact your phone company and they should be able to set it up for you. Good luck!

Hi,
If you have a cell phone, you might not be able to block just one particular number. Call your customer service representative of your celll phone company to find out if it's possible.
If it's a "landline" phone, normal phone, then as suggested by another post, call your phone company. In some serious situations, a particular number might be able to be "blocked".
I do wish you good luck.