Whatsapp phone call is bad
When you text somebody with Whatsapp, you may occasionally want to call him or she immediately to talk to them. Today, whatsapp is implemented a network phone which is something like SKype. However, it is a bad quality of voice. The voice is not clear, is not stable, and is delay. Worst, you would miss some words that speaker said.
Therefor you need a reliable communication channel, the normal mobile network. However, to use the normal mobile network in whatsapp is difficult.
This video teach you how to use it. Subscribe please.