So, in detail, I have a jio sim and a bsnl sim. I am a victim of slow jio speed which is totally random. So i recharged bsnl 333 plan which gives 3gb/day data. So the issue is that when selecting cellone sim as data sim, 4g option is unavailable in jio sim which is placed in 1st sim slot, I need this because I still intend to use jio sim for free calls. So if anyone has been through this or know any solution please help. All I need is use data from bsnl sim in 2nd slot and use calling from jio in 1st slot and also fore 3g only in bsnl sim in 2nd slot. I am using android 7.0