I recently upgraded to Oreo 8.1 beta, and on global I am getting around -115 db, which is moderate/low strength. Should I change it to something else? (Ie 4g/lte, cdma/3g, etc?) Thank you.
You'll get your best reception on the Essential and any phone switching it to CDMA Only. This also saves battery because the phone isn't searching for weak LTE signals all the time which is why I actually switch all my phones to this as Id rather save battery and have a web page load a second later then faster loading and less battery life.
3G can have better reception in general. It really depends on where you are. Telus / Koodo maintains it at a pretty decent speed if you're in a more built up area so it won't be super slow. I used to keep LTE off for that reason but where I am nowadays the signal strength for LTE remains high so I'm not concerned.