"Verizon will give all its subscribers free access to its spam alert and call blocking tools, so long as their phones can support the features. The carrier originally rolled out those tools over a year ago as part of its $3-per-month Call Filter add-on. But starting in March, subscribers with compatible smartphones (including iPhone and Android devices) will be able fend off unwanted robocalls without having to pay extra. Verizon says it will release more info on how to sign up for the free tools near their launch date. ..."
QA Edit: Verizon link about it