J2 mobile is awesome gsm /hspa/ lte network and136.5×69×84mm deminsion it has only 129g weight it has dual 4g sim .net in has very fast speed network . U can use both sim 4g steadly one by one .i also use j2 nearly 1 year nd I get never any prob .But mine has improved battery life it drains onlu I use 4g network continously.good stand-by time.the only problem is it hangs when charge is about 20% and I have to remove the battery and restart again to 0% . Its look very good . Overalll its awesome I love it . I use heavy app also in it I use wwe 2016 1.5 gb also in it .game run in it smoothly . So its ram good . I give 5star . Rock j2