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While there is no official handbook or rule guide, most dating apps operate more or less the same way.
Others promote a dieting website or a travel reservation service.
Others apparently respond to the come-on and supply their credit card number.
"I guess enough people go for it that it makes business sense," said Aelea Christofferson, president of ATL Communications, another company that specializes in toll-free services.
Those instances appear to be outnumbered by ones in which callers reach a phone-sex solicitation.
Critics of the company say it isn't the sex that bothers them, but the acquisition of so many numbers.
The man listed on many government records as the top executive at both Prime Tel and National A-1, Richard Cohen, declined interview requests. They wouldn't have them if they didn't need them," Helein said of Prime Tel's huge pool of numbers.