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Twilio - Brings voice and messaging to your web and mobile applications.
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Bandwidth - Bandwidth offers SIP trunking, Emergency communications, and Voice & Messaging APIs.
RingCaptcha - Onboard and verify mobile users with a single SMS
Voxbone - Fully compliant, enterprise-ready voice and SMS on demand. Build local presence on a global scale with elastic SIP trunks and phone numbers. Try for free.
Spring Edge - Spring Edge offers voice, messaging and authentication API's for business applications.