That is going to be the hard part. You're thinking something like Vonage or Magicjack, neither of which work directly with 3CX, or at least not without a great deal of work (and some duct tape and chewing gum). There are a number of regional cable/phone companies that offer unlimited VoIP plans but will still restrict service to the device that they provide. The majority of "open" VoIP providers charge per second/minute rates. There may be someone out there but it's going to be extremely rare.mtaks09 said:a flat unlimited rate
Founded in 2005, when VoIP was an emerging technology, 3CX has gone on to establish itself as a global leader in business communications.