Cellular Data Problem

I am using an iphone SE ..   When I am away from a WiFi connection, I use Cellular data to communicate with my family... especially when I am traveling...  I have had NO issues with it until I upgraded to the IOS 11.2    NOW my cellular data NO Longer works..   

   I have reset the network system in the phone, I've turned on Airplane mode and then turned it off.. I have turned off the cellular data and turned it back on.. I have rebooted the phone several times and nothing is working to get the cellular data to work..  I am in India right now and really need my cellular data to work...  when it is time for me to fly back to the states, I need that cellular data to be working so I can let my family know where I am as I'm traveling home... 

    When I'm away from the WiFi connection, my cellular data is suppose to kick in for my messaging system .. IT ALWAYS HAS TIL I did the update.... now I can no longer use the cellular data... 

   I cannot do a factory reset of the phone right now.. I'm in India and do NOT want to risk any problems with the phone... I need my phone to be working when am outside the states.. so doing a reset  of the phone itself is not an option... 

  Please any ideas other than factory reset of the phone is much needed