Cellular network connection issues in ipad under OSX (12.1.3)

I had raised this question a week back and may be it was too confusing to attract any notice and draw any answer.  Sorry about that.

The issue is related to ipad air 5 (wifi+lte) with latest osx (12.1.3). I am trying to connect it to the Jio net in India with a Jio 4G SIM card using a “Jio 4GVoice” calling app. I try the following.

·      SIM card is put in the system

·      WIFI is selected (through a personal network)

·      Mobile Data is switched “ON”  (in Settings)

·      Network selection is set to “Automatic

·      LTE is enabled (in Mobile Data options)

Under Settings>General>About  the Carrier is shown as “Jio 35.0 and Network is shown as “Not Available”. Selecting network manually (to Jio4G) has same effect.

·      Resetting network and rebooting repeatedly or switching Airplane mode On and Off has no effect.

·      Change to a different network (AirTel India) has the same effect > Network not available.

·      Followed all steps as suggested in

https://www.igeeksblog.com/4g-3g-lte-not...

From various discussions it appears the network data needs to be updated. For Jio it should be Jio 35.1 instead of Jio 35.0. It probably could be set under Profiles & Accounts. Somewhere it is also suggested to change the configuration. But I don’t know how. Thanks.