Ziply Fiber offers landline phone service as an add-on for their internet plans. However, it is only a true POTS landline for their DSL customers. Customers who purchase their newer fiber internet services will get a digital voice connection (Voice over IP), which is the standard offering from cable and fiber companies. The only difference you’ll notice is that it is cheaper than an analog landline, and will not function if the electricity goes out like a traditional landline.