Check this image you get an clear idea about build app like whatsapp.. For more click this link : https://blog.contus.com/how-whatsapp-works-technically-and-how-to-build-an-app-similar-to-it/
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Check this image you get an clear idea about build app like whatsapp.. For more click this link : https://blog.contus.com/how-whatsapp-works-technically-and-how-to-build-an-app-similar-to-it/