I disabled mine and actually lost a bar.
I've been experiencing poor reception in my home, I was hoping this might help but enhanced LTE is checked off. I set up the wifi calling, that doesn't seem much better either. I'll have to give at&t a call.... from my landline, lol
I have AT&T and a micro-cell and that didn't help reception on the S8...
I have a Galaxy S8 plus and I use AT&T. I never had poor phone reception till I got this phone. I was having calls dropped and bad clarity. I exchanged it for a new phone and got a new SIM card, reset my network settings and nothing fixed it. Then I found out that if you turn off the "ENHANCED LTE settings" it can fix the phone reception. So far it's fixed it. Let me know if you had a similar problem.