The 1st generation was announced in initial 1980’s.
It has a data rate up to 2.4kbps. Major subscribers were
Advanced Mobile Phone System (AMPS), Nordic Mobile
Telephone (NMT), and Total Access Communication
System (TACS). It has a lot of disadvantages like below
par capacity, reckless handoff, inferior voice associations,and with no security, since voice calls were stored and played
in radio towers due to which vulnerability of these calls from
unwanted eavesdropping by third party increases