[Q] samsung sgh i437 at&t network problem while using in india - Samsung Galaxy Express SGH-I437 Questions & Answer

hie frens plz help me out
myself anand
from india
i have samsung galaxy sgh i437 (galaxy express) at&t 4g lte qualcomm
i m using in india and i think the phone is unlocked
the problem is when started to use dis phone
i m getting a network problem...
i can get network use the phone calling,net,sms etc wen i m out of house or just out of sheltar but wen i get into my home or shelter just gets too low get blocked showing circle under xmark it
i tried al the other network but the problem is same i tried changing manually n automatic but n solution
sorry for my english
n thanku
plz any can u find me solution for dis

Solution
Flash MODEM which supported in india.
PRESS THE THANKS BUTTON IF YOU LIKE IT OR I HELPED YOU.

thanku for the reply
sir i m a newbie to dis can u give the me full tutotial step by step to flash the modem n wer will i get it plz plzplz
thnqu very muc

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