YouMail - YouMail turns visual voicemail into a personal assistant for handling all your missed calls.
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
Call Me Private - Call Me Private masks your phone number behind a virtual number, for privacy, or for a professional...
JustCall - The Cloud Phone System of choice for modern sales and support teams. We help end clueless conversations by adding context to every call.
Grasshopper - Grasshopper enables entrepreneurs to build a virtual office that connects callers to employees, wherever they are.
Dialpad - Switch is a cloud-based phone system built for Google Apps users.