How to merge calls in Lenovo K6 Power?

While holding one and calling another person till then its ok, but a message displayed when I clicked on merge call option, the message "unable to merge calls". So how to resolve this issue. In short call conference is not working in my lenovo k6 power phone

Hi Aatish. Which carrier are you with? Your carrier may no longer allowing conference calls that's why you can't merge them.

Not the answer you were looking for?