A personal hotspot is a function of many smartphones and portable devices enabling them to connect the Internet to a local wireless network. This creates a small area of Wi-Fi coverage that allows other devices to connect to the Internet. The smartphone or other device essentially serves as a router.
Most current smartphones and devices have hotspot capabilities or have the possibility of adding a hotspot function. Wherever the device can access its cellular data coverage, it can route as a personal hotspot. Personal mobile hotspots typically cost users cellular data fees and an extra service fee. Some services tether another device to a smartphone and allow only that device access.