I use a company called Viatalk and since it’s a VoIP, it comes with a lot of free features that either aren’t available with landlines or you have to pay extra for. I especially love the Incoming Call Routing feature that Viatalk has. It gives you a lot of flexibility in handling incoming calls from specific numbers. It’s really helpful for blocking telemarketers or other unwanted callers. For example, you can make calls go straight to voicemail, give a busy signal, or play a handful of different messages. You can play a “disconnected” message that plays the recording you get from the phone company when you call an invalid number. You can even play a “blacklisted” message that literally tells the caller they’ve been blocked and to “go away”!