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I am currently testing the mobile hotspot as I am writing you. I figured I would try it out since I've not used it as of yet on my new DNA. 4G is working and intact. No downgrade to 3G, and everything is speedy as expected. I would check your signal strength or other possible issues you may have with reception, as if I understand things correctly, a 4G connection will degrade to 3G in bad connection areas. Maybe your signal strength isn't acceptable? Just a thought. Maybe someone here has a better understanding of the underlying operations of what your particular issue could be. Good luck...
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