Why sound delay in Whatsapp voice calling and how to fix it ?

Hello everyone, I have small question, actually it is about Whatsapp. Whenever I make a voice call using whatsapp, I find there is delay in voice I hear from other person and also there is delay on other side too. Can anyone tell why it is happening. and above all how to fix this issue ?

Just in case any one needs to know, I am using Samsung J2 and my internet connection is idea 3G but I also see same delay if I use my office wifi which is 4 mbps broadband.


Thanks for reading.

It depend to Internet speed because Internet speed is slow down then voice is delay to other person.

This problem is not fixed out it depends to your Internet network. And your handset is 4g supported use 4g network and then try to call.