Gio said they have hd voice calling. but it is just cheating with costmers.
I got the gio sim about 2 months ago. that time internet speed is very good but now days internet speed is decreas.
And when I make a call it cannot done in single time I have to try the call 4 to 5 times then I can talk to other one .
The bigger problem is call drop. when I starting call it cuts in few seconds. this is very irritating.
One more thing is when you have to use another sim for internet it cannot work properly.