Iphone 6S not showing LTE or 3G or 4G under mobile data

setting-mobile data option- roaming(on/off)

with Reliance Jio sim inserted,.

But if I put another SIM like vodafone i find

setting-mibile data option-roaming(on/off),2g,3g,4g

Its only with JIO SIM it does not give me any other option except roaming switching

Thank you,