Why won't Samsung Galaxy A5 get network service when I enter a room or a building?

i bought samsung a5 from singapore a month ago. i use it there using local sim. it works well. now i am in bangladesh. i use grameenphone sim. my problem is when i use my phone in outside it works totally well. but when i get into a room or in a buildig t




Is it like that to every room and building you are in? Cause if it only happens on specific areas, I think it's normal. Like in our house, there's a place where you can't get network signal.


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