J was a little afraid for size but eventually sy is done very quickly and very well. C is a sensitive device at the network level with good reception. It captures well 4g. I do not feel any slowdown despite a 4 cores much less efficient than the LG g3 that I had before (2.5 GHz * 4). I often change of device (Galaxy Note, Note 2 Note 2 4G, note 3, LG g3) and I think that this one, I'll keep it longer pending MediaPad x2! The price of 300 is really great. C is to be seen that the Samsung Call and others exaggerate! In so buy safely!