[Q] s3 i9305 no 4g signal for smart sim help!

hi there guys, can some one help me with my s3 LTE i been searching for any solution for my problem but i cant find anything. i also try to flash jellybean 4.3 CM 10.2 but still 4g not working.. even in 4.1.1 i try it but still not no 4g signal.. i got s3 lte and my sim is SMART ( i philippines). and im in a LTE area here in mandaluyong City.. can someone help me please...

info of my s3


model number: GT-i9305
android version: 4.1.2
Baseband version: I9305XXBME1
Build number:JZO54k.I9305XXMBE3

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