Last year I had lava iris 400s, this is very bad phone always lagging problem just because of its 512mb ram, display colours are average, camera quality is very poor and the front camera is totally useless.
Speaker sound is very low and not clear, touch is bad, always network problem and most thing battery takes too much time for full charge but it remains just 3 hours on net. This is a very slow phone and has not proximity sensor, lava iris 400s is worst phone, don't go for it.
