Apple India — Issue(Before Submitting): Network is continuously in "...searching" state Issue(After I received my device): Unable to activate

Case ID:[protected]
Reference ID (as per job sheet): 4ZMVG5YVKVZC

Issue(Before Submitting): Network is continuously in "...searching" state
Issue(After I received my device): Unable to activate

My new phone has been submitted to Apple authorized service center in Varanasi @Reliance Retail Limited, Maldahiya, Chetganj and it has then shipped to Bangalore for further technical investigation.
After few days I have been informed that there is some "unauthorized modifications" as per the Bangalore technical team who reviewed my mobile phone.

My Query & Concern: If i face some issues in using my phone, how would I bring my new iPhone to some other unauthorized places where it can be modified when I my device is already having the apple authorized warrantee.

Talked to number of executives, the complaiant was registered on[protected] and until now I am unable to use my phone as it is of no use since I am not able to "activate my device"

I will be looking for a fast response on this since already this request has taken a long time.