Database Users

[Q] samsung sgh i437 at&t network problem while using in india

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

Lost Data connection Every 5 mins ( G900H )

Hello , I had before galaxy S3 and S4 with origianl rom there was the same probem , after flash with cyanogen rom all was OK , Now i have the GALAXY S5 g900H , I lost 3g connection every 5 mins but there is no cyanogen in this model now
So who can please extract the MOD FLASH from cyanogen 7.. and up of connection DATA ONLY ( Only to resolve this problem )
Please give me a file to flash with recovery mode to resolve my phone
My phone is rooted and under extrestolie
Please i need only mod flash for data connection
Model G900H
Ps:that was the same problem in previous model S2 S3 S4 ALL SOLVED WITH Cyanogen rom
Thank's
Please be a hero and help me

Help me please .. I will brok it if there is no solution :/

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INFO
GALAXY S4 GT-I9500
LOLLIPOP V 5.0.1
CUSTOM AURORA PORT NOTE 4 ROM