Enhanced LTE option gone when I inserted sim in my first slot. My sim card is capable of voLTE. But now am not able to make voice calls could use only data. Previously before I was inserting sim card the option was there. Asus kindly ask your r & d team to work closely with Jio4G network in india and provide solutions for our problems. Quick fix would be much welcome one. Model : ZE550KL. We trust you Asus.