As I know we all face many problem once when we have sim card in our handset or hotspot or in dongel. But our sim card connectivity and network become stronger or best when their is tower near in our area .Now I mean to say near means not near to our home or house but at least on near to Mountain top or on the top of building . especially when our building or apartment is in height ( that is situated in tarrece of building to get good signal quality) . So now according to me to find such thing we have to do some research which I have done as follows: 1) . I try to find which brand tower is connected to near my local area ( which is lokmanya nagar where I stay) . Now I have seen in my friend mobile which have jio sim his speed is always be slow even in open area too. The reason is I found no antenna from lokmanya to indira nagar but on my apartment or society where do I stay on top of my building only I found Airtel tower. Due to which I buyed airtel sim card.2) . Dont worry if you still dont want to do the above activity you could proceed it with next activity that is about speed test activity. As I know ookla is the best app available on market for IOS , Android and windows too . Download it and test your network capability of your sim card. Try it two times : Once inside your house.And perform other activity outside your house that mean in open area choose for the one which show at least 12 Mbps speed I think which will be a good speed . For 4G network in india . And see it to that both of the test performed must be in your area ( i.e. inside your own house and open area means outside your own house and in your own local area) .3) . Keep in mind whenever you use the brand named sim card ( like airtel, idea , jio and Vodafone) for wireless hotspot use keep your hotspot in open area that is try to make a stand at your balcony or grill of window so that you will get full range and the speed of data connectivity of 4G internet will work at its best . ( I have put an image of my own stand made from cardboard flat box open from upside and attached through grill by using Red tape or electrical tape and here is the place where I keep my hotspot ) .4) . After doing such above activity I have also displayed an image of speed test of 4G network ( of Airtel) through airtel hotspot buy using ookla app please refer too it.So if please try it and if you want to use your internet connectivity by real 4G network please try to use in open area as far as possible dont keep it beyond walls of your house because it may weaken the strength of your 4G signal for any 4G sim. Thank you.