Hi Mansoof,

I hope you are well. The latency depends on the speed of your internet connection. If your internet connection is poor you are going to have high latency which will cause you to have bad call quality. Please perform a speed test on your internet connection and post it in your next reply. I will advise you on, if the internet connection is sufficient enough to handle the phone calls. 

Thank you. 

Hi Mansoof

Please also let us know what internet connectivity you are using

Hi Mansoof

Your latency will increase whenever you are in an area of good LTE signal. VoIP is extremely reliant on having a strong LTE signal