Sprint iPhone 5 free hotspot?

I have an iPhone 5 on sprint. Recently personal hotspot showed up in my settings menu and it actually lets me use it even though i don't have it in my plan. I wanted to know if this happened to any one else and if its safe to use it without getting billed for it.

Your cellular data is on

Sprint charges $19.99 for 2gb data usage with their hotspot, expect to get charged for the usage if you use it.

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