ESP32 with UDP send/receive text. Chat mobile-mobile UDP. Testing Extension UDP by Ullis (@Ulrich_Bien) - Tutorials and Guides - MIT App Inventor Community
Mobile Hotspot with mobile Internet - Digital Republic
Amazon.com: NETGEAR Nighthawk M6 5G WiFi 6 Mobile Hotspot Router (MR6150) – Blazing Fast Wireless Hotspot Router, Unlocked, Certified with AT&T and T- Mobile, for Secure Internet at Home Or Everywhere You Go :