The reason that caller ID cannot be blocked to 800 and 900 numbers is that it is used for billing purposes by the telephone company to the person or business who owns that 900 or 800 number. EX: L.L.Bean ( alarge mailorder sporting goods store in Freeport,Maine) gets thousands of calls from their clientele around the country.The 800s because they are not charged to the person calling the L.L.Bean must be charged to someone to pay the expenses of running the telephone equiptment and the profits going to the stckholders so who pays ? The businesses pay. A way must be found to figure out what they owe and the only way to do that is to keep records. They records as they stand now include the phone number from which they were dialed and the length of the call. My phone call to them from Scranton ,Pa will cost the L.L.Bean less then Tim Mays from California because I am closer. That is unless I perhaps have a package missing and need to stay on the customer service line for twenty minutes or longer when he just placed an order and got off in under five. THe phone company looks at the L.L.Bean phone records and send them a bill that includes how much it cost me to make that phone call to them to find out if the package got lost and Tim's to order that wheelbarrow and all the other callers. Each caller will have cost the L.L.Bean a different amount of money. The telephone number on the reords. It can be used to track down teenage hackers who want to upgrade their disk drives(Bean has none) and other stuff too dependent upon the size of the company (not Bean)and the integrity of the employees. It could conceivably be used by an unscrupulous employee from Sadie's S and M to blackmail someone or the whole clientele list. This is unforunate. What could concevably be done is that the software could be reprogrammed to delete the phone number immediatley after the computation. Or to have the computation done immediately and deltion to accompany it. third, the phone company could reprogram it so the mileage and time is computed somhow without the logging of the caller. All of this has to do computer programming and I find none of the aforementioned an impossibility to achieve. moroni