Put a static HTML website on a SanDisk Connect USB, which is basically a WiFi microserver with a battery in a USB flash drive format, with the data actually being on a microSD card: https://www.sandisk.com/goto/connect One serious use case for web servers on phones is in countries like Iran or Saudi Arabia where information dissemination carries real risks. When combined with flash mobs, it's this century's answer to Samizdat. Then you have the people seeding flash drives with entire copies of offline Wikipedia in .ZIM format in North Korea.