Yes, Ive faced a problem that the data connection automatically change in to sim 2 Ive put that on sim 1.but almost every mobile phone company make the first sim slot as the major sim because it can hold and use maximum radio frequency. So using 2 sim at once may occur problem some time. And its also use a huge amount of battery!
Do u know Iphone 5 is also made in china? Isnt worried? No. The company made their product in china but the technologies are their own. My J5s materials have import from Vietnam and Malaysia. But they all were assembled in china. Thats doesnt mean that the product is a China clone or a bad product. The companies like Apple and Giant Samsung dont want lose their market in world trade for poor product made in china.
The positive side of the phone- Its camera is superb, like a DSLR without ZOOMing lance. Its ram is a little short but its processor is very fast. Its battery life is very good and a good device as gaming phone.Ive compare it with samsung A5 and A5 is just ahead by the ram and rom. But j5 has bigger external card support and 2 sim support A5 is optional dual sim. U can buy it as it has a long battery life as all want in a Android OS devices.
Have u added your google account? If u havent, u cant download from play store
thnk u