Does the personal hotspot on iPhone 5 cost money?

I've heard it just takes data from your phone that you have, so every new month I get 6GB back from what I used.So, does it take away the 6GB or like cost a bit extra on the bill?

I'm with Bell.

Yes it uses your phone service to do a hotspot so if you only have a certain amount of data a month it uses it up fast.

No, it does not cost money. If you have 3 or 4 or whatever G then your iPhone turns that into a wireless signal and so your iPhone can become a modem.