| AP | Andhra Pradesh Telecom Circle. |
| AS | Assam Telecom Circle. |
| BR | Bihar & Jharkhand Telecom Circle. |
| CH | Chennai Metro Telecom Circle (includes Chennai, MEPZ & Mahabalipuram). |
| DL | Delhi Metro Telecom Circle (includes NCR, Faridabad, Ghaziabad, Gurgaon & Noida). |
| GJ | Gujarat Telecom Circle (includes Daman & Diu, Dadra & Nagar Haveli). |
| HP | Himachal Pradesh Telecom Circle. |
| HR | Haryana Telecom Circle (excludes Faridabad, Gurgaon & Panchkula). |
| JK | Jammu & Kashmir Telecom Circle. |
| KL | Kerala Telecom Circle (includes Lakshadweep). |
| KA | Karnataka Telecom Circle. |
| KO | Kolkata Metro Telecom Circle (includes parts of Howrah, Hooghly, North & South 24 Parganas and Nadia Districts). |
| MH | Maharashtra Telecom Circle (includes Goa but excludes Mumbai, Navi Mumbai & Kalyan). |
| MP | Madhya Pradesh & Chhattisgarh Telecom Circle. |
| MU | Mumbai Metro Telecom Circle (includes Navi Mumbai & Kalyan) |
| NE | North East India Telecom Circle (includes Arunachal Pradesh, Meghalaya, Mizoram, Nagaland, Manipur and Tripura). |
| OR | Orissa Telecom Circle. |
| PB | Punjab Telecom Circle (includes Chandigarh & Panchkula). |
| RJ | Rajasthan Telecom Circle. |
| TN | Tamil Nadu Telecom Circle (excludes CH Chennai, MEPZ, Mahabalipuram & Minjur and includes Pondicherry except Yanam & Mahe). |
| UE | Uttar Pradesh (East) Telecom Circle. |
| UW | Uttar Pradesh (West) & Uttarakhand Telecom Circle (excludes Ghaziabad & Noida). |
| WB | West Bengal Telecom Circle (includes Andaman & Nicobar, Sikkim excludes Calcutta Telecom District). |
| ZZ | Customer Care (All Over India). |