Change the amount of time before Mobile Hotspot mode turns off
By default, if your BlackBerry smartphone isn't connected to a power outlet and your smartphone and the other devices
that are connected to your mobile hotspot are inactive for 15 minutes, Mobile Hotspot mode turns off automatically to
conserve battery power.
On the home screen, click the connections area at the top of the screen, or click the Manage Connections icon.
Click Networks and Connections > Mobile Hotspot Connections > Options.
Change the Auto Shutoff Timer field.