Does it cost money to update a iphone software on your phone?

Just want to make sure i don't want to pay extra money

No, All you have to do is plug it into a computer - make sure it is plugged into a computer otherwise it stuffs up the whole phone and won't work!

~Hope I helped!~

If you mean upgrading it from iOS 5 to 6 or 6.0 to 6.2, I have never been charged for any of these upgrades.

No. Never has, never will.

What happens if you have no computer?

Does it still cost money if I have no computer