RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Dialpad - Switch is a cloud-based phone system built for Google Apps users.
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
Nexys Mobile - Mobile Phone plans and Services for highly mobile small business workers and entrepreneurs who run their lives from their phone.
Plivo - Plivo simplifies your customer engagement.