So far I've been testing out low-power, handheld LoRa radios running the Meshtastic open source firmware on them. The data-rate isn't great, at 37.5kbps, so slightly slower than traditional dial-up. It's line of sight, but it can travel 250km with a handheld device. The handheld ones can be linked with bluetooth to a phone, or USB to a computer, to send messages to other devices. The really cool part is in the name thiugh, you can achieve greater distances by meshing with other nodes. There are also devices and designs made to be used as stationary repeaters, and they sip power. You can run one off a 5-10w solar panel, with an 18650 to keep it going when the sun isn't shining. The community also kind of already has a bit of a solarpunk element to it in my opinion :) Oh, and they're cheap! That repeater project is about US$50 but a handheld one is only ~US$20.