What is the Full Form of STD?

STD Full Form is Subscriber Toll Dialing. This code is known ass STD or Subscriber Trunk Dialing. The national service providers, as well as the private companies, make sure that the subscriber gets the best ever service and that there is an uninterrupted connection between the two parties. On the other hand, if you have to dial a number in a foreign country them it is STD call. STD is a type of telephonic system which allows users to make trunk calls independently without the assistance of any operator.