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I've just done some research into this and if this doesn't resolve the issue, it appears they cannot be turned off. The reason it's being sent is to let you know that it's a LTE only cell. It's a safety thing as while 4G/LTE works on most devices, there is a still some people with 3G only mobiles who won't have reception and won't be able to make normal or SOS calls in an emergency.
The internet is a wonderful place.
I am a Telstra Employee however i am posting in my own time. My opinions are my own and not that of Telstras. I am a customer of Telstra.