Telephone Technology

From Alexander Graham Bell's first spoken words to the smartphone in your pocket, the telephone transformed human communication. Explore the invention, switching systems, trunked radio, and the mobile revolution.

Explore Telephone Technology

1876-Present

The Invention

Alexander Graham Bell, the patent race, early exchanges

1876-Present

POTS & PABX

From dial tone to VoIP — plain old telephone, PBX, SIP trunking, UCaaS

1960s-Present

Trunked Radio

Shared frequencies for public safety, APCO Project 25

1973-Present

Mobile Telephony

Cell phones, 1G to 5G, smartphones