First to fall its a free network so you dont need to pay anythink to buy this sim card its prepaid connection . having so many call drops on AIRTEL, VODAFONES number . network coveres is not bad , n 4 data speed is owesome .
If u dont have true 4g handset ( volte - lte is not true 4g ) it meens it take a battrh consume bcoz call will go from data sarvice ( from lte hndst call will go by data if u off ur data incoming n outgoing will also off .
In volte hndst in/outgoing call will eble while data off .