I have a Galaxy S23 FE and a Vivo V30 Pro. I use both with Jio SIMs in the same location, but my Galaxy S23 FE's network bar is not full; it always shows one bar less than my Vivo phone, which always shows a full network bar.
I have a Vivo T3 5G priced at only 15k, but I received Android 15 seven days ago. However, I haven't received Android 15 on my 75k Galaxy S23 Ultra. Samsung is only focus in their s25 series