Area Code 135 – Dehradun, Uttarakhand
The phone area code for Dehradun, Uttarakhand is 135 (international format +91135). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 135
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Dehradun, Uttarakhand
Geographic Overview
Area code 135 is a geographic National Destination Code (NDC) assigned to the city of Dehradun, the capital of the northern Indian state of Uttarakhand. Dehradun serves as the administrative and commercial hub of the Garhwal region, and this code covers the city and its immediate surroundings, including the adjoining towns of Herbertpur, Vikasnagar, and parts of the Doon Valley. The code is administered under the Indian numbering plan, which follows ITU-T E.164 recommendations.
Dialing Formats
When calling a landline in Dehradun from within India, the subscriber number is typically 6 digits long, and the full national dialing format is 0-135-XXXXXX. From outside India, callers must use the international format: +91-135-XXXXXX (or +91 135 XXXXXX). For example, a local number such as 123456 would be dialed as 022-135-123456 from Mumbai or 011-135-123456 from Delhi, but as +91 135 123456 from the United States or the United Kingdom.
Caller Instructions
Local callers within Dehradun can often dial just the 6-digit subscriber number without the area code, depending on their telecom operator's local calling policy. However, for clarity and to avoid misdialing, it is recommended to include the area code even for local calls. National callers from other Indian cities must prefix the area code with the trunk prefix '0' (e.g., 0-135-XXXXXX). International callers should replace the trunk prefix with their country's international exit code (e.g., 011 from the US, 00 from most European countries) followed by India's country code +91, then the area code without the leading '0'.
Overlay and Numbering Considerations
As of the latest updates, there is no overlay code for Dehradun; the 135 area code remains exclusive to the region. However, with the growth of telecommunications services, the Telecom Regulatory Authority of India (TRAI) may introduce additional codes in the future. Subscriber numbers under this code are allocated to fixed-line services, including PSTN and fixed wireless terminals. While some VoIP services may use this code for virtual numbers, the primary allocation is geographic.
Practical Usage
Businesses and residents in Dehradun use this code for all landline communications. When listing a number internationally, it is crucial to format it as +91 135 XXXXXX to ensure proper routing. For travelers, understanding this code helps in making local calls and receiving calls from abroad. Always confirm the current dialing procedures with your telecom provider, as local dialing rules may vary.