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Twilio - Brings voice and messaging to your web and mobile applications.
WAuth.in - Simplifying SMS OTP-less authentication with the power of WhatsApp.
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Auth0 - Auth0 is a program for people to get authentication and authorization services for their own business use.
BulkSMS - SMS messaging service provider offering two-way SMS communication services.
karix - Karix is a messaging and communication provider which helps in connectivity. Karix solutions provides messaging platform to marketing, voting of services.