| Name | Numbers |
| Change of Telephone Number in English | 1952 |
| Change of Telephone Number in Tamil | 1953 |
| Directory Enquiry | 197 |
| Local Assitance | 199 |
| Morning Alarm | 116 |
| STD Complaints | 28253232 |
| Time in English | 174 |
| Time in Tamil | 175 |
| Trunk Booking | 180 |
| Trunk Booking ( International) | 186 |
| Trunk Enquiry / Cancellation | 181 |
| Trunk Enquiry ( International ) | 187 |