Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Telbee.io - telbee adds voice messaging to podcasts, websites, social media and email to easily hear from and build human relationships with your customers and community - save time, reduce frustration, and gain sales, understanding and fans
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
Vocaroo - Vocaroo is a quick and easy way to share voice messages over the interwebs.
Plivo - Plivo simplifies your customer engagement.
spoonity - Spoonity is a white labelled, POS-integrated loyalty solution for the QSR business.