Depending on the phone's operating system, phone owners can block calls by installing apps that offer this service. Some phones, such as the Samsung Galaxy S5, also come with native call-blocking features that owners can use.
Log onto the Google Play Store or Apple App Store and search for call blocking apps. Popular examples of Android apps that can be used to block incoming calls include DroidBlock and CallFilter.
Google Voice is a communication service offered by Google. It comes with a call screening feature that owners can use to block unwanted calls. Owners do not need to alter their original number to gain access to this function. Simply choosing Google Voice for voicemails allows access to this function.
Another way of blocking a call is to contact the phone carrier and request that the offending number be blocked. This service is typically offered under different names, such as Parental Controls. Some networks, such as Verizon, offer this service for free, while others charge a small rate. Networks may also have a maximum limit of how many numbers can be blocked, as well as restrictions on the length of time the block stays in effect.