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Twilio - Brings voice and messaging to your web and mobile applications.
GatewayAPI - GatewayAPI is a professional SMS gateway with first-rate services at low prices worldwide. Over 300 million SMS messages are sent annually through GatewayAPI by among other Google, Visma, Pfizer & Samsung.
Clockwork SMS - Clockwork is an Easy Text Message API. An SMS API for Developers. Build powerful apps and include SMS. Signup is free, Try it now.
Vonage - Vonage is a cloud-based all-in-one VoIP software solution designed for multiple industries such as accounting, healthcare, finance and marketing etc.
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
Sinch - Sinch is a powerful voice and messaging SDK that lets you bring your apps to life with VoIP and...