I have already a jio 4g sim with 4g phone .some days ago I am buy a samsung galaxy a5 2016 and after some days I am get a jio 4g sim with preview offer whose valide 29 oct 2016 but after 5th september this convert into welcome offer whose valide on 31 Dec 2016 but when my jio sim in preview offer then I am full enjoy with this sim and I am download 179 gb data in only 15 days and after that I am use around 15 gb on preview offer jio speed is very good I am get on my pc around 6 mbps downloading speed and browesing speed is very good but after 5 th september speed is very bed beacuse my num is convert into welcome offer and in this offer I am get only 4 gb data per day after that speed reduce on 128 kbps and when I am use my 4 gb per day I am get max speed 600 kbps only and after that this jio speed is very bad as like 2 g sim and when I am calling any one then I am facing network busy problem . if any one want any arugent call then don’t use jio for calling beacuse this sim west my 5 to 10 mins for one call connect and in a day many times networks of this sim not geting my phone but when I am go my villege and I am see jio netwrok then my jio netwrok are full strenth overall this is avarge in this time but this is opening of this company so I am satisfy with this comanys free calling and msg for life time on net reachrges but when I am calling to customer care and hold around 20 mins but nobady pic my call this is not good for any company overall this is good not batter