Actually it is fairly easy to make this happen by following the step-by-step guide below. According to your feedback, you just want to transfer a MP3 file onto your iPhone and then set them as sound. If you want to save your money, why not create the coolest ringtone for yourself. But for most users, they get used to changing their mobile ringtone every couple of days. If you do not want to use iPhone’s own ringtone, you may buy preferable ringtones from the iTunes store, and then sync them to your iPhone.
