I have karbonn titanium mach five mobile.We can use this mobile easy.This mach five mobile looking good, its design is attractive.I purchase this mobile from Amazon. but something wrong when use it., mach five touching is not fast working. when we go back from any functions its touch is not work properly.like hang phones, This phones ringtone is very good quality and up volume.But in headphones sound quality is not good, not bass, battery backup is not use longer time. This phone charge in 1 and a half hour. when we use this phone, its board heating. when we download some more apps in this phone, Its processor work slow(Hang type). Karbonn service care staff is not work fast. karbonn care office not available in more places Like Intex, Micromax, Lava and other mobile handset service care.