Lots More Information
Related HowStuffWorks Articles
- How Cell Phones Work
- How the iPhone Works
- How Cordless Telephones Work
- How Long Distance Calls Work
-
What do digits in phone numbers mean?
- How do digital answering machines work?
-
Is it possible to detect if someone is illegally using my phone line?
More Great Links
- Caller ID FAQ
- Patent #4582956 - the Caller ID patent

