Best VoIP/WiFi calling services for the US?

Looking for a cheap way to call the US using VOIP or WiFi. Do such options exist? I've tried Vonage, WhatsApp, Skype, Hangouts, Line, etc. They all work intermittently or with a VPN and that results in poor call quality.

I need a surefire way to do this with the best quality audio as I use it for work and for conference calls.
Today, I got cut off in mid sentence talking to a client and apparently I sounded like I was talking into a fish bowl.

Could people share whats worked for them? Which VPN, which internet service providers, apps, times of day, or any other combinations


Magic Jack

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