on Google please have solved the problem by upgrading the firmware to Indian version. Samsung is now not bothered since you have already bought the phone. Samsung can provide the upgrade but they won't. Samsung customer care service is hopeless.
dear frinds .. the volte fiture is only for indian version like g935fd ..from outdoor seller give g35f mean the global version .. the global version not support volte .. in about device it can be fake . for chack phone version go into downloading mode and chack version