Indian State and Metro Cities STD code

 While you calling by landline the need to prefix with phone number .prefix number is std code(stands for subscriber trunk dialing)

Indian  Metro Cities STD code

 011 - New Delhi,Delhi
 020 - Pune, Maharashtra
022 - Mumbai, Maharashtra
033 - Kolkata, West Bengal
040 - Hyderabad, Telangana
 044 - Chennai, Tamil Nadu
079 - Ahmedabad, Gujarat
080 - Bangalore, Karnataka

Indian STD codes Statewise

State	Total
Andaman & Nicobar Islands	11
Andhra Pradesh	756
Arunachal Pradesh	3
Assam	212
Bihar	221
Chhattisgarh	23
Delhi	1
Goa	26
Gujarat	715
Harayana	263
Himachal Pradesh	116
Jammu & Kashmir	28
Jharkhand	17
Karnataka	1087
Kerala	234
Madhya Pradesh	502
Maharashtra	774
Manipur	2
Mizoram	1
North East	89
Orissa	325
Punjab	532
Rajasthan	553
Sikkim	10
Tamil Nadu	369
Uttar Pradesh	7
Uttar Pradesh East	178
Uttar Pradesh West	92
Uttaranchal	3
West Bengal	475