Samsung SM-T335 Tab 4 8 Inch LTE Help! - Galaxy Tab 4 Q&A, Help & Troubleshooting

I have recently bought a new Samsung tablet.
It says the tablet is LTE supported. I checked that and yes this model SM-T335 is LTE enabled.
The prob is that the tab does not show LTE option in network selection in Phone>Settings
When I bought the shopkeeeper enabled the LTE from Service Menu.
Now , Idk but somehow the phone lost 4G signal and only shows 2G.
There is no problem in SIM.
I have checked the SIM.
Can anybody help me how to enable LTE from Service Mode ?
Thank-you

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