Search STD code by either city name or city code provided by the Airtel, Reliance, Jio, MTNL, Bharat Sanchar Nigam Limited. For obtaining the STD codes, users have to enter the name or code of the city. This is a mandatory field. Link of state-wise STD codes are also available.
The total length of all phone numbers (area code and the phone number) is constant at 10 digits. For example, the number 7513200000 signifies the 0522 (the area code for Lucknow) followed by the phone number.
Fixed-line or landline numbers are at most 8 digits long.