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My name 4G network has become very slow after December security update. When I removed my sim card and put in another smartphone, everything is fine. When I use other sim card, the problem comes back. Only 4G faces this issue. 3G is fine.Galaxy A7 20...
Since the Oreo update, network takes more than 50% of my battery. I have reset my mobile phone but nothing has changed. Two of my friends who have the same device are facing the same issue. We live in Ivory Coast (Africa). How can we fix this issue? ...