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Most unlimited long distance calling plans, as well as the local and international unlimited services, are VoIP; meaning that the service is sent over the internet, instead of over landlines. Using VoIP drops the cost of calls to the point where you can now get unlimited local and long distance phone service for less than $20.00 per month, and you can add "Unlimited World Calling Plans" with some companies for less than $10.00 more per month.
All of these unlimited phone services are going to require high speed internet service to work. But the combined cost of high speed internet service and an unlimited calling plan is usually less than the cost of a landline phone with local and long distance service on it.