The Department of Islamic Affairs in Dubai has haram-ified using another person's WiFi services without their permission. According to Gulf News, the Department of Islamic Affairs and Philanthropy in Dubai has determined that stealing WiFi from others constitutes behavior that violates Islamic morals.
Just as using or taking another person's property without paying or gaining their permission, doing the same with a WiFi connection is also not considered proper Islamic behavior, they argued.
Issuing this fatwa stems from a meeting in the Fatwa section of the department, in which someone wondered about the possibilities of using someone's WiFi without them knowing. The group decided to delcare this secret usage as haram, on the basis that using someone else's connection could slow down service to the rightful owners.