My 4G Network is turned on in settings, but no signal!

4G is not working in my Samsung SM-T807V. I'm using Wifi to access this website.

I ensured the “Mobile Data” under Mobile networks was switched on. Signal strength is zero! Is there a easy fix?

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crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
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