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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.
SuprSend - Single Notification API for Every Channel (SMS, Slack, Whatsapp, Email, SMS, Push, App Inbox)
CallHippo - Easy to use Phone System with World-Class Support
Vibtree - Communicate on Cloud
Numero eSIM - Numero eSIM is a phone-number app that makes voice and data possible anywhere in the world, for free.
MyOperator - MyOperator is a cloud-based call management system for voice communication purposes.