Samsung. Z4 is very poor quality phone because of feature contain. One of my friend bought this phone he was saying most worst phone is that some of feature let me tell its contain 1gb ram 8gb internal memory which is very less. 5 megapixel primary camera which has poor quality picture and 5 megapixel front camera which has no work. 4.5 inches screen. phone looks is also Not nice. Frens if you are willing to buy any smartphone than I will suggest not to buy this phone. Thank for reading