PS: certain statements in this commentary are likely related to hardware or software failure. Former owner of a sp direct competitor Samsung, I must say I am very disappointed by this S4 but I want to once again remind that it is possible that this is due to a defective item. So Regarding the qualities you know, beautiful screen, photo quality extraetc! Me on the bug as often (I recall my former such for two years i had bugs 0 or 0 of a microsecond latency but absolutely 0!) The answer mp3 player rarely the primary key of the headset! and as a precedent or fast forward are non-existent from there. Sometimes the reader to put 15 seconds to respond. The quality of the headphones is very average. Voice commands, controls movements and eyes work very arbitrary! The battery does not take long. At the beginning we said that this is may be due to the fact quon not loose it as the first time but after even without passing any calls and taking all precautionary power saving, the battery down below 20% to 18H! As for lOS I do not know what to say! or competitors have a 10000 semiotic experts team be those out there that do bossent Tuesday afternoon, but now with an office and an interface for the apps, one for one sy widgets loses some. And this morning, this is the icing on the cake! I recharge my last night as up to 100%, I put it in airplane fashion I close all apps and jefface ram and this morning off phone with 0% load. Another detail, when the smartphone vibrates, it emits an unbearable noise, it seems to me that this is the web of the objective picture vibrating against the plastoc the main body of such because even when I open the shell, the noise persists! That, I am very disappointed after this first contact with Samsung / Android and I'm not even want to acquire another Samsung to see. I just return my item for refund.