Companies that have been around a long time, and have enough money and customers to stay afloat, are companies like Lingo, Packet8 and even Vonage; though they still make me nervous. Like I said, do your research, see who has enough operating capital for the next year, and only sign up for a month to month plan. (You don’t want to end up paying $199.00 for a year’s worth of service, only to have the company go bankrupt the next week)