I am using this SAMSUNG J2 mobile from long duration at 4G network. some time it work really very very good but as many time it will become very very laggy because of its internal storage as well as its some disadvantages like that we can’t transfer internal download app in to external memory card. First of all the app is downloaded in internal this is first drawback.after that Ram storage us very small as today era it is not satisfiable storage. So I requested to people who want to buy this mobile that they think about another handset. For brand they have to modify its features.