BSNL – Dial *123*Number# or Dial 123 and follow instructions
Tata Docomo – Dial *135*2*Number#
Airtel – Dial *101*Number# or *121*3# or Dial 123 and follow the instructions
Aircel – Dial *124*Number#
Idea – Dial *457*Number#
V0dafone – Dial *140*Number#
Uninor – Dial *222*3*Number#
Videocone – Dial *123*2*Number#
Reliance – Dial *368*Number#