Asus zenfone 4 is good smart phone in small price .It has a 1 GB of RAM which is sufficient for normal application it can also run some high class game like asphalt 8 and many other.
It is 4 inch display size.
It is come along with 5 MP rear camera and 0.3 MP front camera.
IT is equipped with 1.2 Ghz Intel Atom Z2520 processors, as we know that Intel is number one in processor manufacturing
It has good display which come with cornimg gorilla 3 which is hard enough to break;
IT has good touch sensitivity .
It has good user interface, good launcher, according to me zenfone has the best launcher that I had ever seen.
It has a nice battery standby, it last for 24 hours.
Overall performance is good.
It has good sound quality, It has low volume as compared to other vendors.
According to me it is best smart phone in this price range.And I suggest you to buy this phone without any interferences it is good Smart phone