FIX 4G SAMSUNG J3 SM-J327T: FREE FREE FREE

1: go to dial and put this *#2263#

2: Band Uncheck LTE BandSelection

3: Click LTE

4: Click All LTE

5: Close this Window

6: go to dial and put this *#2263#

7:band disable setting 

8: select LTE

9:Click RESET

10:LTE Band ALL Check & 

AFTER ALL RESTART PHONE 

DONE

 IF NOT FIX FLASH THIS FIRMWARE BELOW AND REPEAT STEPS: