I want to buy a ringtone from ITunes. How will I be charged?

I want to buy a ringtone for my iPhone 4s through ITunes. How will I be charged? Will it come out of my bank account or will it show up on my phone bill? And will I be charged every month for this ringtone or just that one time? I've never bought anything through iTunes.

Ringtones will be charged through the same way you pay for apps through the app store. It is a 1 time buy. If you have never bought a app, buy an iTunes Voucher.