You may have a relationship with the phone mistress that has been cultivated over many years or a very short term relationship where there's been intimacy but nothing more lasting, but the mistress on your phone is more likely to be someone who you have met on the phone and have always had some form of contact with. So if you're feeling confused and vulnerable then you have just found a fantastic friend and they are not actually the mistress on your telephone at all, but are in reality just someone you know through your phone.