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Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Azure IoT Hub - Manage billions of IoT devices with Azure IoT Hub, a cloud platform that lets you easily connect, monitor, provision, and configure IoT devices.
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
iothook - Restful data platform for the Internet of Things. IoThook Features
Plivo - Plivo simplifies your customer engagement.