I always like to buy a iphone because its a famous brand and I using it before few years ago.its have a 1 gb RAM and internal memory have in different kinds like 16gb, 32gb. But its have one disadavtages that is battry backup is too bad.If we use more hours like 2 -3 hours continously then immediately dead . its battry backup not like as another phone. But iphone never hang and its give a good camera clarity.some people never buy it because its a expensive .yes its exactly but those people capable to buy it then they must read my reviews.