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To use the native hotspot, you'll need to use a ROM that already has an unlocked version built in. If you didn't load a custom ROM, then you'll need a 3rd party hotspot app such as wireless tether or foxfi (personally I've always used wireless tether when on a stock ROM), I'm not familiar with Foxfi at all.
Rooting via RegawMOD only gives you superuser access to the phone's files, rooting alone doesn't unlock the hotspot feature.
The link I posted above allows for you to use the sprint hotspot app. Its really easy all you have to do is add one line of code to the build.prop located in your system folder
I'm not trying to hijack your thread here, but I'm having an issue with this as well. My build.prop doesn't have ro.tether.denied=false. I'm on viperROM 1.2 and Sprint Hotspot doesn't work.

I'm really a newbie. I thought tethering was with the USB cable. I talking wireless. Isn't that what hotspot is?
The link I posted above allows for you to use the sprint hotspot app. Its really easy all you have to do is add one line of code to the build.prop located in your system folder
I'm not trying to hijack your thread here, but I'm having an issue with this as well. My build.prop doesn't have ro.tether.denied=false. I'm on viperROM 1.2 and Sprint Hotspot doesn't work.
It's not supposed to have it
Add it in there anywhere and it will prevent the error message
I tried this and turned on Sprint Hotspot. At first it appeared to work, but then I see an error, "Data Call Failure" followed by "Error Code 67. Unable to establish wireless data connection."