Jiofi is good for 2g and 3g handset or mobile phones but if you are 4g user ypu donot need jiofi . but for 2g and 3g users I recommend that you should have a jiofi by which you can use jio sim in your 2g and 3g mobiles. Because jio gives cheapest data in India from any other company .its a best choice for you if ypu are using 2g or 3g phones.so buy it for your Goodness