How do I transfer Apple Gift Card balance to iPhone 5c without a Mac or other iPhone?

I ordered a iphone 5c to use i would like to know how to get a apple gift card balance onto the iphone and no i do not have a mac or other iphone. Thank you for your time!

[Re-Titled by Moderator]

Original Title: Hello I want help trying to find out how to get a apple gift card balance on to a iphone 5c!