I am using htc 820 it’s best mobile with 2Gb Ram with fastest installation. Easy to use and easy to handle and sound quality is very highly and display is 5.5 inches and display is very large and like gorilla glass and it’s very fast usage but after few months of usage battery life is decreasing and phone then if kept more than many hours charging the battery well be die and after one year mother board failure HTC service center couldn’t be repair again