Hi...i hav been using 2 sims in my redmi 4 phone.one is jio which is 4g..other is airtel and i hav been using the sim in 2g.for the last few weeks second sim is not showing any signal/network.jio 4g is working fine but mobile data speed is reduced as compared to earlier..i have put the same air tel sim in another mobile and found that it is working fine..also i have done factory reset..still the problem exist..i am really frustrated..pls provide a solution if anybody knows..my redmi software update version is 10.3.1 since last 6 months..