Callmama - Get cheap international calling, international virtual number, Call Mama Gives an added advantage to send message and make calls to non-user of Callmama App.
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
CallHippo - Easy to use Phone System with World-Class Support
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
Numero eSIM - Numero eSIM is a phone-number app that makes voice and data possible anywhere in the world, for free.
Plivo - Plivo simplifies your customer engagement.