On a local level, I feel like we can probably do better than just text messaging capabilities. Mesh network covering the village, with someone running mirrors of essential services in their basement (local email routing, wikipedia, etc)
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At most you will only be able to start a few Android-phone hotpspots and share files. That is the reality of it.
At most you will be able to charge smartphones and small devices with solar panels. Keeping a larger Wi-Fi router running only on solar? Very seldom.
Try to avoid understanding this difficulty from your own shoes, but rather from the shoes of communities very limited on what is reachable to them from a technical, financial and logistical point of view.
I know you can solve it easily. I can solve it even more easily myself.
Now see any disaster area, see any remote area. Setting up Wi-Fi is invariably never a priority for those in such situations. Even as things settle, it is still more practical to share files directly with each other.
When you see from that perspective then you are on the domain of realistic solutions rather than keyboard level on virtual forum.
The point here is to have it setup before the proverbial shit hits the fan.
Resiliency preparations are a fundamentally different ballgame to disaster recovery - you have more time and resources to prepare, your supply chains aren't broken yet, etc.