Final answer:
Both tethering and wireless hotspot functionality are typically controlled by your wireless carrier. They are responsible for providing these services, determining any associated costs, and setting data usage limits as part of your mobile data plan.
Step-by-step explanation:
Both tethering and this wireless hotspot functionality is often controlled by your wireless carrier.
Tethering and hotspot services allow you to share your phone's internet connection with other devices. Your wireless carrier typically has control over these functionalities, including whether they are available on your plan, any additional costs, and the amount of data you can use. This control is due to the carrier's management of your mobile data plan and the permissions set on your service agreement. While the device's operating system facilitates these functions, the ability to use them without restrictions is often dependent on your carrier's policy.
Cellular modems and routers can also provide tethering and hotspots, but these too are regulated by your wireless carrier's data plans and policies.