Aeon Mall in Sen Sok district has legendary wifi and endless seating where you can charge everything and plan Cambodia routes. Food court has actual bathrooms that don't require tip money. Total cost: 2000 riel bubble tea to earn your throne.

Wifi handles video calls to mom back home while their AC battles the 38°C Phnom Penh heat like a champ. Can sit there for 6+ hours plotting Siem Reap buses and nobody cares. Way better than $4 Brown Coffee wifi when your backpack budget is crying.