Can I update my iPhone without a PC?

I have an iPhone 3gs and I want to updatethe software. Mydad updated his iPhone 4s without a PC is there a way I can update my iPhone without a PC?

Yes it should be possible for the 3gs to be able to update over the air. Just go to settings, go to general, then to software update. Be sure that your phone has over 2 gb of memory storage to be able to successfully update.

Only if you are on iOS 5 or above, you can update it. To check, go to Settings>General>About and check version number if the first number before the decimal is a 5 or a 6, you can update it by going to Settings>General>Software Update. If it shows 4 or below, you will have to use a PC.