I found this guide on decoding pager signals. I thought it might be a great way to get phone numbers to prank. The dongle is only $15 on amazon so I ordered one and have been able to decode pages in my area at 931.7875mhz and 929.6125mhz. I am seeing lots of phone numbers now.
http://www.rtl-sdr.com/rtl-sdr-tutorial-pocsag-pager-decoding/