That will depend on your definition of STD - subscriber trunk dialling or sexually transmitted disease.
1944
STD dialling began in the UK in 1958.
STD, or Subscriber Trunk Dialling, began in the UK in 1958.
STD service commissioned between Kanpur and Lucknow in 1960
the same time the eggs were introduced to the uk
In the UK, STD (as in Subscriber Trunk Dialling) came into use gradually in the late 1950s.
In the UK, 0140 is an incomplete STD code (telephone area code); you need one more digit. In India, 0140 is an invalid STD code.
Short Message Service was introduced in 1985.
speed postal service
The UK
4562439BC
Mid 1960s.