[Q] SVLTE, how to enable ?

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Jun 16, 2015
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I have 2 G900Vs. I use phones in foreign county.
1st device has no any problem using SVLTE(1x voice, Data on LTE ), but 2nd device can't.
2nd device use only either 1x(+Evdo) or LTE only.
Two devices can use LTE/WCDMA (CSFB), but Only one device can use SVLTE, the other can't.
Same network, same MIN and USIM, same User.. But two devices are different.
I think 2nd device may be out of order.
Any one know this problem ?
Thanks.

Firmware NHA(4.4.4)
Network Mode : LTE / EVDO
 
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