Better than Ringcentral

The app lets you choose to call out on cellular or Internet. Much better voice quality when you choose cellular and app is stable. And I have Verizon 4G service in Atlanta on an iPhone 6s, so that should tell you a lot about the reliability of calling out on VOIP all the time. The company Line2 does a great job of updates and keeping it stable and reliable.

Ghickmanmm about Line2 - Second Phone Number, v9.6