This is the guide about how to set dual clock on an LG Optimus LTE 2, the settings can remove the dual clock while roaming. I have tested this on my F160K.
How to set the dual clock on LG Optimus LTE 2
Warning: Change the settings at your own risks. I’m not responsible for any damage or brick.
LG Optimus LTE 2 Phone Photos - LG Cell Phone Pictures
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thanks lte2 4.1.2