I am using this phone from 2014 december, and I am very happy with my sony xperia c4.i just love my phone .sony xperia c4 is a smart sexy slim attractive hand set.sony had made a good product because the performance of phone is very smooth and fast .because of big internal storage its helps phone to run fast .the features of this phone is very very effective specially camera and sound qualitty awasome.i must say sony is great .the most important part and feature of this model is .u can use 2 facebook 2 whats app, at a time because u can run 2 profile parell at a time with different mail id.i love my sony c4 .go fot it