Can Whoscall block the phone call starting with certain numbers? Whoscall Service Center September 10, 2020 07:25 Whoscall is unable to block the phone numbers begin with a certain number due to the restriction of the iOS system. Related articles Why would I receive calls from numbers that I had already blocked? Can Whoscall block Unknown numbers? Can I block or report numbers through the pop-up dialog? Does Whoscall automatically block unknown numbers? Can Whoscall block SMS? Comments 0 comments Article is closed for comments.