Telephone systems1

The Telephone

By jacksonh17

  • The telephone is invented

    Alexander Bell invented the telephone.

  • The telephone transmision extends between major cities

  • First transcontinental telephone call

  • Rotary Dial invented

  • First telephone to combine ringer and handset

  • First longdistance calling avalible

  • First commersial digital transmission system

  • First 911 call is made

  • First portable cellphone call is made

  • Public tests of a new cellular phone system

  • 100 million cellular telephone subscribers