HTC one is the old version la, if u wanna change, why dont get the latest one?? which is HTC One Max, with better features.
it got bigger screen which is 5.9 inches, we can even control the electric appliances by using the phone, and also the feature which is love the most - HTC Zoe with sequence shot, always smile, object removal. and still got many other features.
check out here! http://www.htc.com/sea/smartphones/htc-one-max/ - http://www.htc.com/sea/smartphones/htc-one-max/