Cingular has mobile ringbacks. Mobile ringbacks are tones the user hears while they are awaiting for the person to answer the mobile phone. Cingular calls their ringbacks answer tones. This is a term that they have called for mobile ringbacks. Cingular mobile ringbacks or answer tones can be purchased for 99 cents. Cingular mobile ringbacks do expire after a certain period. It is possible for certain users to hear certain Cingular mobile ringtones.