The Tamil Nadu Telecom Circle provides a good service throughout the state and offers facilities like basic telephones, ISDN, Internet, leased line and I-net. Apart from these, they also provide the cellular service. The use of telephones in Tamil Nadu is increasing day by day and the growing number of telephone connections prove the point. Even the villages are no alien to this fact and most of the villages in the state are under the telecommunication system. Telephone Codes of some of the main cities and towns of the state are given below:
| Cities | STD Codes |
| Chennai | 044 |
| Coimbatore | 0422 |
| Cuddalore | 04142 |
| Dharmapuri | 04342 |
| Dindigul | 0451 |
| Erode | 0424 |
| Kancheepuram | 04112 |
| Nagercoil | 04652 |
| Karur | 04324 |
| Krishnagiri | 04343 |
| Madurai | 0452 |
| Nagappattinam | 04365 |
| Namakkal | 04286 |
| Udhagamandalam | Not Available |
| Perambalur | 04328 |
| Pudukkottai | 04322 |
| Ramanathapuram | 04567 |
| Salem | 0427 |
| Sivagangai | 04575 |
| Thanjavur | 04362 |
| Theni | 04546 |
| Thiruvallur | Not Available |
| Thoothukudi | Not Available |
| Tiruchirapalli | Not Available |
| Tirunelveli | 0462 |
| Tiruvannamalai | 04175 |
| Vellore | 0416 |
| Villupuram | 04146 |
| Virudhunagar | 04562 |
Last Updated on 1/17/2011
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