Can you answer a question about Visible? [telecom]

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Does anyone have info on Visible (

1. Does this use cellular voice, or is it an application transmitting voice over "cellular broadband data?"

2 If using "cellular broadband data," which the FCC has declared is not a public mobile service but, instead, a private mobile service, is this a common carrier subject to CPNI privacy and other common carrier regulations?

THANKS!

Harold