The great news is that there are free alternatives for finding phone numbers, but you will have to listen to ads to get your numbers:
- Free 411 (1-800-FREE-411): Automated 411 phone service that requires you a listen to a 15 second ad to use the service.
- 1-800-411-METRO (6387): You listen to more ads, but you get to talk to a real human and the service connects you to phone number for free.
- 1-800-555-1212: Automated toll free directory assistance, no ads, and live operators during the day.
- Google's SMS: Type something like "pizza san francisco ca" and SMS to the following number to 46645. You will get a few listings that match your query.