AVOXI - AVOXI to deliver amazing call quality & an exceptional customer service experience.
Twilio - Brings voice and messaging to your web and mobile applications.
Sonetel - Sonetel is a communication app that lets you make an international business call at the cost of local calls.
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
TextNow - TextNow is a mobile virtual network operator (MVNO) that provides a free phone service to users by using other cellular networks coverage.
Plivo - Plivo simplifies your customer engagement.