Whatsapp made effort in implementing voice call chat on whatsapp previously. after that so many was put to discovery. They increased group members to be 250 in numbers and even as that, theyprovided an option for sending PDF files for friends when chating.
Most of the people that was opportuned to test Beta version of whatsapp video chat call testified that each time they want to make video call, that there is always a popup either for you to choose video or voice call.
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The video and voice calls uses Megabyte for them to work or connects.