The best way to block an undesirable person or company from calling a phone is to use the phone’s built in blocking software. If a phone is not equipped this type of software, blocking software can be downloaded.
Most modern smartphones come equipped with number-blocking capabilities. To access them, users need to go to the phone’s menu. Usually, these types of programs are found in the phone’s Settings area under commands such as Blacklist, Number Block or Do Not Disturb. Upon clicking on the command, a new window pops up. After entering the phone number to be blocked and clicking Engage, the number is blocked from the phone.