Im not sure if this goes in community I will move it just let me know 
Normally I wouldn't recommend an app but if you don't mind sacrificing not more than 2% a day of your battery life to better the signal maps for cell signal data. Here is an application I have found useful. Yes root metrics uses this data to measure networks I found that out through much Q&A. So if you want to give a little back and possibly help yourself a bit. Download the app. Run it.. go into settings collect a 1000 data points a day.. I've done it along southern Idaho. Heck a couple of my friends showed spots I didn't know cell was at. On Trinity peak LOL.
I am curious what the community here would think about doing so. We are mostly tech geeks and I kind of geek out to this stuff. I noticed another website that uses the data from open signal to provide extensively more information.
Plus I really want a thread where I can share some knowledge so lets see how this goes. If its a big enough question into theory or anything else You can break the thread off into a seperate question but link back to here so we dont flood the forum with questions lol!
If your android contributing on cellmapper is more ideal however you may pick your poison if you so choose to partake
Android OS Link:
IOS Link:
If your feeling up to the more advanced collection:
https://www.cellmapper.net/map PS if you want to know how to use this interface to view more complicated cellular data or what clarification on what everything means ask away below. I am very knowledgeable on the topic as my degree is in this field of communications engineering. Uhm though I will warn I think Cellmapper needs root privledges so theres a choice for everyone no need to ruin warranties!