Check out these newsgroups:

• alt.ph.uk Phreaks and Hackers in the United Kingdom(The best newsgroup for UK material) Read the FAQ before you even think about posting!
• alt.cellular
• alt.cellular.oki.900
• alt.cellular-phone-tech
• alt.cellular.tech
• comp.dcom.telecom.tech
• alt.cellular.gsm
• uk.telecom
• tnn.comm.pagerPagers
• comp.security.misc
• comp.security.firewalls
• comp.security.anounce
• alt.security
• alt.2600
• alt.hackers