Well… here is some information about all that. When you have no signals you can’t make calls :- P That means your cell can not find Tower to use. But if you do not have sim card…? this will be bit different. Technically you can access the cell networks without sim card. Obviously you can […]
Telecom Circle: Andhra Pradesh, India
STD - Subscriber Trunk Dailing
STD or 'Subscriber Trunk Dialing' codes are designed to dial long distance calls with out any operator assistance. In India, there are 2646 STD Codes under 22 Circles. Each circle is divided into telecom districts under which local telephone exchanges assign numbers to the individuals. Subscriber Trunk Dialing or STD system applies only to land-line numbers. There are public and private networks who operate land-line numbers in India.
To trace any land-line/STD number and to know the network operator, location details, you can use this Number Tracker. To search more STD codes using fuzzy logic, you can use the STD Code Search tool.