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The most inexpensive adapter-based VoIP provider is..
My VoIPProvider.com's updated their listings of more than 250 U.
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My VoIPProvider.com's updated their listings of more than 250 U.S. VoIP providers with a list of some adapter-based VoIP providers ranked in inverse order of yearly cost.
SunRocket's initial yearly cost of $199 ranks at the top of this compilation.
You can also see the full list here.