The FTC's 900 Number Rule requires that ads for these 
services "clearly and conspicuously" disclose the cost of 
the call. The law is very specific about what "clear and 
conspicuous" means, depending on whether the ad appears on 
radio, TV, or print. The rule also requires that 900 number 
ads directed at consumers under age 18 disclose that 
parental permission is required before calling. The rule 
prohibits 900 number services directed at children under 
12, unless it is a "bona fide educational service." In 
addition, 900 number ads that promote sweepstakes must 
state the odds of winning or, if the odds cannot be 
determined, the factors that determine the odds. Ads for 
900 number services that provide information on federal 
programs, but are not affiliated with the government, also 
must contain certain disclosures. For more information, see 
Complying with the 900 Number Rule.