Comment Re:Hmmm (Score 1) 262
Asking for your telephone number was a way of getting a unique identifier for each customer, allowing them to track your pattern of purchases. (They never called the numbers; Radio Shack did no telemarketing. They just used them as a database key.) There was the potential confound of multiple people living at the same address and having the same phone number, but it was the best they could do at the time outside of asking for your name and address, which would have been far more time consuming. Nowadays stores use loyalty cards or match your purchases to your credit card, but those tools weren't available to Radio Shack when they started collecting phone numbers.
If you also gave them your address (as you would if you had made a request to receive catalogs) they could have potentially used your purchase pattern to send you customized flyers, though so far as I know Radio Shack never did that. Target, years later, is a notable example of a company that DID send customized flyers and got in hot water for it: http://www.forbes.com/sites/ka...
Knowing the patterns in which people buy things is valuable data for a company. Even if they don't have any way to match it up with your personal information and thus have no way to contact you, it gives them information on things like which products are bought together or by the same people, which would allow them to design more effective advertising.