Friends, i phone is my favourite mobile and I discover a new feature in it.usually it have touch lock, but if it is not working you have to type your password, that is boring, so for quickly unlock, here is a tip.first of all you have to go on settings, then touch id and password option then open change password option than you can write there only one no. also as password.for ex.-you can set password 3 or 0 etc.then save setting then when you unlock I phone you have to type only that one password like 3 and ok option visible their and click on it, by this you can quickly unlock I phone instead of 4-5 word password.so you have to purchase I phone.it is durable.