Can i use my hotspot without charges being added?

I have a iphone 6s plus with metro pcs. I have unlimited data, i pay about 30$ monthly, i'm not sure if i can share my hotspot, do y all guys know if i can without any charges being added?

Yes you can share it, and it will be used up faster the more devices you allow to connect through you phone, than if you use it from your own devices. And it won't cost you anything extra, unless your plan states that it cost extra to share with others that are not on your account (and it very doubtful that it would).