The modem I just noticed is different between 4X and 4 SD Indian Variant.
Note 4X
支持频段: GSM B2/B3/B5/B8
WCDMA B1/B2/B5/B8
TD-SCDMA B34/B39
CDMA2000/1X BC0
FDD-LTE B1/B3/B5/B7
TD-LTE B38/B39/B40/B41(2555-2655MHz)
Note 4 SD India Variant
Network bands:
4G FDD-LTE B3 / B5
TDD-LTE B40
3G WCDMA 850 / 900 / 1900 / 2100MHz
2G GSM 850 / 900 / 1800 / 1900MHz
Singapore uses LTE band 3 and 7. 4X fits Singapore better.
And since the modem is different maybe the Global firmware for Note 4X may not be the same. Have to wait for XM to release 4X global firmware.
Note 4X
支持频段: GSM B2/B3/B5/B8
WCDMA B1/B2/B5/B8
TD-SCDMA B34/B39
CDMA2000/1X BC0
FDD-LTE B1/B3/B5/B7
TD-LTE B38/B39/B40/B41(2555-2655MHz)
Note 4 SD India Variant
Network bands:
4G FDD-LTE B3 / B5
TDD-LTE B40
3G WCDMA 850 / 900 / 1900 / 2100MHz
2G GSM 850 / 900 / 1800 / 1900MHz
Singapore uses LTE band 3 and 7. 4X fits Singapore better.
And since the modem is different maybe the Global firmware for Note 4X may not be the same. Have to wait for XM to release 4X global firmware.