一个论坛上看到的，写着：
International premium rate numbers bring big money to you and change your life. Just find the low cost or non-cost sim cards and dial the IPRN to collect the minutes. The number provider will pay different rates according to different countries. It is easy to buy non-cost sim card from black market so it can dial most high rate numbers.
很短的简介， 我看完简直想破口大骂了， 这真的是勾引无知的人去犯罪啊！ 不知道怎么用树洞， 所以用马甲了。