Apple India — no service bug on iphone 7

Address: iPhone india

I have been using my iphone for 2 yrs recently it does not connect to networks it only shows 'no service' i tried all different options like resetting formating wipe whole data but it still shows no service. I approached the icare they said apple has been providing phone replacement for complaints on no service issues but no replacement for iphone a1178. Please i request apple india please!! Alot o[censored]s iphone users are facing this problem but no help from iphone india. Please don't show inequality please provide replacement for iphone a1778 series.