Iowa Code § 714A.3
Advertisements for pay-per-call service shall clearly state if the charge for the service is on a flat rate basis, the total charge for the call or, if charged on a per-minute basis, the charge per minute for the call, the charge for each additional minute, and the amount of time necessary to complete the call. Additionally, if in order to obtain the full advertised services or other merchandise, a caller will be required to make any payments in addition to the cost of the initial call, that fact shall be disclosed, along with the amounts of such additional payments. If the advertisement is oral, all cost information must be disclosed clearly and at the same audio volume of the ensuing program prior to providing the pay-per-call number and each time the number is mentioned.
Iowa Code § 714A.3
91 Acts, ch 171, §3