telcos do not listen in , that is still a criminal offense. The times you here that is on sales and service calls, which is a conversation with a telco employee, or in these days contractors. The fallacy of this is that when you have a problem with billing due to the lying contracted employee, saying anything to get a sale, knowing he will be paid his bonus and gone when the customer realizes they have been overcharged , or there is a special fee that the rep promised was not applicable . This happened to me and i fought it to the top of that chain to another state district, guess what they could not find any recording that would prove the rep had given false info on price. You need to record it yourself or do what i do, send me the info in the mail period.