Area Code 644 – Dera Ghazi Khan

Geographic Coverage and Administrative Jurisdiction

The area code 644 is a geographic National Destination Code (NDC) assigned to the city of Dera Ghazi Khan (often abbreviated as D.G. Khan) and its surrounding administrative district in the Punjab province of Pakistan. This code is used for fixed-line (PSTN) services within the Dera Ghazi Khan Telephone Exchange, which operates under the supervision of the Pakistan Telecommunication Authority (PTA) and is primarily serviced by the state-owned operator, Pakistan Telecommunication Company Limited (PTCL). The coverage area includes the urban centers of Dera Ghazi Khan city, as well as adjoining towns and rural areas within the district, such as Kot Chutta and Taunsa Sharif.

Dialing Formats and Caller Instructions

For callers placing a call from within Pakistan to a fixed-line number in Dera Ghazi Khan, the standard national dialing format is:

• 0-644-XXXXXXX (where X denotes the subscriber number, typically 7 digits).

For international callers, the country code for Pakistan is +92, and the leading trunk prefix '0' is omitted. The correct international format is:

• +92-644-XXXXXXX

For example, a local call from Lahore to Dera Ghazi Khan would be dialed as 0644-XXXXXXX, while a call from the United States would be dialed as 011-92-644-XXXXXXX (or +92-644-XXXXXXX on mobile phones).

Numbering Structure and Overlays

Subscriber numbers within the 644 area code are seven digits long, resulting in a total national significant number length of ten digits (including the NDC). As of the latest PTA numbering plan, there are no overlay codes for Dera Ghazi Khan; the 644 code is exclusively dedicated to this geographic region. However, due to the increasing demand for fixed-line services, the PTA may introduce additional numbering capacity in the future, but no overlay has been announced to date.

Important Considerations for Callers

When dialing from a mobile phone within Pakistan, it is essential to include the trunk prefix '0' when calling a fixed-line number, even if the caller is in the same city. For example, a mobile user in Dera Ghazi Khan must still dial 0644-XXXXXXX to reach a landline in the same area. Conversely, when dialing from a fixed line to a mobile number, the mobile number is dialed in its entirety (e.g., 03XX-XXXXXXX).

For businesses and individuals who frequently communicate with Dera Ghazi Khan, it is advisable to store numbers in international format (+92-644-XXXXXXX) to ensure seamless dialing from any location worldwide. This practice also helps avoid errors when using VoIP services or international calling cards.