IPhone 4S, how/can I redeem an iTunes gift card in my phone?

I have bought a iTunes gift card and I have an iPhone 4S, does anyone know how or if I can redeem a gift card on my phone without having to go on my computer?

Go to iTunes and go to music. All the way to the bottom, there should be a button that says redeem. You can redeem it there. Or go on the computer, iTunes>iTunes store>side bar>redeem.

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