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Cell service is virtually nonexistent for all services save for Verizon, and Verizon is awful. Towers are few and far between and you are lucky to be able to send/receive texts in main populated areas. I would not count on cell phones unless you use them as cameras, and make sure you have space as you will not be able to back up to the cloud while you are in the park.
I am not sure about a solar generator for electricity to charge phones--many of the campsites are shaded and you may not get sufficient sun to charge well. I also can't imagine leaving a solar generator unattended, unless you had some way to lock it to the picnic table, which may or may not be in sunlight. Most serious RV campers relied on generators for electricity though beware that most tent camping spaces prohibit generator use (you need to be in an RV area for that), and the time for generator use is limited. Someone has to be at the campsite for generator use, so that is also a downside as however long you are running the generator, someone can't be out hiking, etc.
Tent sites have no hookups. There is usually a cold water spigot nearby for multiple tent sites to use to fill water. There are no electrical hookups. Sometimes there is a single outlet in the bathroom that may be used for hair dryers, etc, but I honestly can't recall seeing anyone charging phones in one in either Madison or Grant Village.
You may do better by investing in something like a heavy-duty power core that will give you multiple charges. I have this Anker charger and have been happy with it--definitely a brick to carry around but nice when I know I'll need multiple charges and will be a while without access to electricity.
Get a dummy battery and a battery pack for 7.4V (two cell lithium). Stock batteries are just over 1,000 mAh, but external batteries are available much higher than that (you can easily drop 10,000mAh or more into a shoulder rig). I've got both a wall adapter and extended battery for my A7Sii, depending on environment.
Easiest way for the non-electrical among us is to get something like a power coupler ([link]) and then run a USB battery pack behind it ([link]). If you discharge one USB pack, you can hotswap to another w/o shutting down at all. More than likely, though, you'll fill your storage media before that happens.
> anker 20000mah
Son of a bitch!! Is it this one??
Fuck, DID YOU BUY IT ON BLACK FRIDAY TOO?? Get your own life, weirdo!