With IO Phone you can mark numbers as spam to prevent them from getting through to your company. When you find a number that is a spam caller, simply go to the call log and select the check box next to the number. Then choose the drop-down button next to the delete button and choose Mark as Spam. If 3 or more companies using IO Phone mark a number as spam, we will make it a spam number for all IO Phone accounts. If for some reason there is a number that never got through to you, it's best to click on the log entry to see what happened. If the number is considered a spam number, it will tell you. In that case, you can close the log entry, select the check box next to it, and then choose Mark as Not Spam.