Cell phone coverage?

[Still Steppin']

I'm curious --- and, I wonder if what I'm curious about would be of interest to others here.
Is there any map of verified cell phone coverage areas in the Whites --- localized NH 4000 footers specifically?
If not, could one be produced if enough first hand info was provided by posters here? Is there anyone interested in attempting to pull something like that together? I am not that person!
Thinking something beyond the providers "ought to be" coverage maps. A start might be coverage at trailheads and/or summits.
Thanks in advance for any suggestions.

 

[David Metsky]

It's going to depend on the type of service, the type of phone, foliage, atmospheric conditions, and probably a few other variables. It might be useful in some situations but it's never going to be something you can depend on.

 

[Scarpy]

I'm sad to report my Sprint IPhone works almost everywhere. I keep it shut off but I can't help but check.