What is the cheapest phone service? Tello offers the cheapest of the cheap when it comes to a new cell phone plan... but it is slightly limiting. You only pay $10 a month but you will find yourself with just 1GB of data. However, for that price Tello is throwing in unlimited calls and texts, free mobile tethering and no contract to tie you in.What is the abbreviation for plain old telephone service? How is Plain Old Telephone (service) abbreviated? POT stands for Plain Old Telephone (service). POT is defined as Plain Old Telephone (service) very frequently.What is a plain old telephone system? Plain old telephone service (POTS) is an analog telephone service implemented over copper twisted pair wires and based on the Bell Telephone system. This system connects homes and businesses to neighborhood central offices. A central office is ultimately connected to other offices and a long distance facility.What is a plain old telephone line? Simply put, they are “Plain Old Telephone Service” lines. Everyone has them. They are the local phone lines you get from your local bell company or other local exchange carrier. They give you dial tone and can be used to make and receive calls.