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Twilio - Brings voice and messaging to your web and mobile applications.
MessageBird Voice API - Add programmatic call capabilities to your app or service
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
MessageBird Chat API - Connect with your customers through different messaging apps
BulkSMS - SMS messaging service provider offering two-way SMS communication services.
MessageBird API on StdLib - Purchase numbers, send SMS and more with one line of code