Samsung Galaxy S5 Mini Smartphone (4.5 Inch Touchscreen, 16GB memory, Android 4.4) Black (Wireless Phone)
Had previously a HTC Rhyme, then S3, but that struck me as too broad. The size, shape and appearance of the S5mini are perfect. You may wonderfully operated with one hand. Otherwise, the battery lasts really long and can be luckily exchanged at Samsu