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Twilio - Brings voice and messaging to your web and mobile applications.
LINK Mobility - LINK Mobility is Europe's leading provider within mobile communications, specialising in mobile SMS messaging, digital services and multi-channel conversational communication.
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Melrose Labs SMSC Simulator - SMPP SMSC simulator to test SMS messaging applications.
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.
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.