I have the same issue. It is showing my location as Chattisgarh everytime I open Maps. I have also tried all the settings, but nothing works.
Try changing the Access point name in SIM settings. it worked for me.
It was released in India and then withdrawn recently
If you are facing problems with your mobile data, check the APN (Access Point Name) settings.
I had the same issue after Oreo update but it was...
I think you can long press the mobile data or wifi from quick settings drop down to see the available wifi networks or mobile data networks.
I had the same issue after Oreo update. But it was rectified by changing the Access Point Name in SIM settings.
You just have to turn on the data roaming.
Settings --> SIM and Network --> SIM1 --> Data Roaming
As per OnePlus' website, there are service centers in India. Check out the below link.
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Same issue for me as well. Mobile data is not working. Even after reboot it's not working...