Actually you can say all the illegal stuff you want on the phone....Until the act is in person (face to face) the law has not been broken (of course this means booking a date only) LE is only interested in in-person transactions. Most states require identification of the target and intent as key elements. However, it is always better to not talk in detail on the phone for both parties. Most Federal and state agencies are interested in human trafficking only...as they should be....no one should have to do things they do not want to do.