Modern day telephones primarily use fiber optic cables to send messages. These cables transmit data as pulses of light through glass or plastic fibers, allowing for high-speed communication over long distances. Fiber optics offer advantages such as higher bandwidth, lower signal loss, and immunity to electromagnetic interference compared to traditional copper wires. This technology has significantly enhanced the quality and reliability of telephone services.
Any kind i think!
microwaves
Collagenous
Telephones Pop TV Cars
Im's
Mail, Radio, and Hardline Telephones
polyester fibers.
spindle
reticular
VoIP telephones in PBX, is a kind of phone system which is centralized through pbx and from 1 number it will allow you to create extensions, for instance if you phone number of 999-2921 from you can create 999-2921-001 and so on.
depends what kind of phone yoh have
nerve cells...........