I have AT&T too and preordered my note 10 plus from them. So far I havent had that issue or any issues on my new Note. My signal actually improved dramatically from the s10+ I had previously to now on my note 10 plus. My s10+ had horrible signal on it and I also live in town where there is normally excellent signal and strength. You may have to do a factory reset on the phone as well. But it should help.
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