How to block a number on a cell phone?

Hi, so pity that you suffer from such type of calls. I don’t know type of cell phone you are using but now cell phones comes with the option in there setting through you can block the incoming or the out going calls. I think you need to block only that particular call that is irritating you. So for that you go into the menu, scroll down to settings. There will be a option named as calls click on it. Under that you can find manage calls and accept calls. now it is important to understand so be careful, accept calls will allow you to receive calls from the people who calls you or the people in you call list. So this is how you can recive call from anyone who calls you or only the people you want. There will be also an option for block all incoming call, plz say no to this.If your phone do not have this option than the only thing you can do is contact your service provider and ask then to block the number from which you receive unwanted calls. usually they do not charge for this but still if they do then it will not be more then $2 or $3. You can contact you service provider using their toll free number, I think its 611 for AT&T.