Today there is a question that a 4g jio sim can work in 3g phones . no that is not possible it only works in 4g phones because in 4g phones there is a 4g slot for 4g sims but it is not present in 3g phones . all the news of 4g jio sim is that it can work on 3g phones is fake . in 3g phones jio sim cannot activate . I have tried it myself yesterday I have brought I jio sim and tried to activate on 3g phone but it didnot activate that time I had seen all the videos of how to activate jio sim in 3g phone in youtube but not a single trick work that is all fake and then I used jio sim in my red mi note 3 the sim is activated in 15 min . so guys please dont try to do this because jio sim only works in 4g phones