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Twilio - Brings voice and messaging to your web and mobile applications.
Plivo - Plivo simplifies your customer engagement.
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
BulkSMS - SMS messaging service provider offering two-way SMS communication services.
HeyWire - Next-level customer service is just a text message away.
Textlocal - Textlocal is an app that allows for individual and group texting. It is designed for businesses that have employers and employees who need to communicate with each other, making it easier to announce group meetings and special announcements.