Depending on additional features, a basic phone service that includes unlimited local calls costs $15-$30 per month. At AT&T[1], for example, a residential line costs $23 and also comes with caller ID ...

The cost of a business phone line can range from $20 to $30 per month ... In terms of phone hardware, you probably already have a cordless home phone, but a basic model would cost around $40. The cost ...