Forget about whatever tweakings cos it'll never work, Samsung phones are inferior to iphones in this aspect. I've went as far as to file a complain to my telco about this as I initially thought this was a telco problem. I've noticed this problem from when I had my S10. Me and my childhood buddy who hangs out all the time and whenever we're together surfing the net indoors (at Cafes or malls), my S10 & my note 20u would be struggling for 4g signal whereas his then iPhone x and now iPhone 12 (both using same telco) would be happily surfing the net and at the same time making jokes about me and my stubborn love for Samsung mobiles.
