No 4g on LG G3 D855 International Unlocked

Hi Droiders,
Im experiencing strange problem in connecting my phone to 4g LTE.
I bought LG G3 International version(D855) recently, where Im unable to get the 4g connection, right now I'm able to see only 'H'. I also see that there is no option of 4g in network mode, moreover i tried all the hidden settings which were mentioned in the others posts.(*#*#4636 ,... and some other codes)
Which could not rectify my problem.


Can anyone help me in connecting to 4g.

thanks

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