If you are looking for a way to block unwanted calls on your landline phone, there are a few options available to you. The best call blocker for landline phones is likely to be a service that allows you to select which numbers to block. This way, you can ensure that only the numbers that you want to hear from will be able to get through. There are a few different providers of this service, so be sure to shop around and find one that meets your needs.