That's called advanced messaging and on my LG phones that could not be disabled. The only time it doesn't work is if you are texting someone who is not on T-Mobile or is using an iPhone.
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I'm using an LG phone too and there's no option to disable it. I'll just add that it'll send it with the Advanced Messaging service when connected to VoLTE or Wi-Fi.
This is also causing an issue to use hands free in my car. It will not read or the messages that come through this as a chat. Must be able to disable to safely drive. All other people I receive messages from work just fine, but not from another t-mobile lg phone so frustrating.