Bharat Sanchar Nigam Limited

Telephone and Mobile
BSNL provides both fixed line telephones and mobile telephony services on GSM platform.

BSNL Mobile
Main article: BSNL Mobile
BSNL Mobile is a major provider of GSM network under brand name CellOne and BSNL all over India. It has wide network coverage in both urban and rural areas of India. It has over 121.82 million customers across India.

BSNL Mobile offers prepaid, postpaid services and value-added services such as Free Phone Service (FPH), India Telephone Card (Prepaid card), Account Card Calling (ACC), Virtual Private Network (VPN), Tele-voting, Premium Rate Service (PRM). It also offers the IPTV which enables customers to watch television through the Internet and Voice and Video Over Internet Protocol (VVoIP).

BSNL Landline
BSNL Landline was launched in early 1990s. It was the only fixed-line telephone serving for whole country before the New Telecom Policy was announced by the Department of Telecom in 1999. Only the Government-owned BSNL and MTNL were allowed to provide land-line phone services through copper wire in the country. BSNL Landline is the largest fixed-line telephony in India. It has over 9.55 million customers and 47.20% market share in the country as of 28 February 2021.

Internet
BSNL is the fourth largest ISP in India, with having presence throughout the country. It also has the largest fibre-based telecom network in the country, around 7.5 lakh kilometers, among the four operators in the country.

BSNL Broadband
Main article: BSNL Broadband
BSNL Broadband provides telecom services to enterprise customers including MPLS, P2P and Internet leased lines. It provides fixed-line services and landline using CDMA technology and its own extensive optical fiber network. BSNL provides Internet access services through dial-up connections as prepaid, NetOne as postpaid, and DataOne as BSNL Broadband.

BSNL Bharat Fiber
BSNL Bharat Fiber (FTTH) was launched in February 2019. It offers TV over IP (IPTV), Video On-Demand (VoD), Voice over Internet Protocol (VoIP), Audio On-Demand (AoD), Bandwidth On-Demand (BoD), remote education, video conferencing services, interactive gaming, Virtual Private LAN services. BSNL said that, its huge optic fiber network provides fixed access to deliver high-speed Internet up to 300 Mbit/s.

Bharat Net
With effect to Govt. of India's policy decision to provide state-owned BSNL with another revival package worth 1.64 lakh crore rupees, the struggling PSU was merged with Government's special purpose vehicle BBNL. This gave the struggling PSU a boost and an additional advantage of additional 5.67 lakh kilometre of optical fibre which has been laid across 1.85 lakh village panchayats in the country using the Universal Service Obligation Fund (USOF). Currently, it has an optical fibre cable network of over 6.83 lakh kilometre.

BSNL 4G
BSNL started 4G service in some parts of India since January 2019 such as Bihar, Jharkhand and Uttar Pradesh, but is limited to a few cities or towns. Most of 4G services are currently available in Southern India. However, BSNL is trying to launch pan India 4G services up to September 2022. The telecom minister said that BSNL will launch its 4G services all over India on 75th Independence day of India along with various other projects.

BSNL 5G
On behalf of the Govt. of India, the hon'ble Minister of Communications Ashwini Vaishnaw announced that the State-Owned Telco would start its 5G operations by 15 August 2023. He also added that the 4G and 5G network of the state-owned BSNL would be a completely home-grown indigenous 4G and 5G network technology; thus, emphasising more on Govt. of India's Atmanirbhar Bharat.

IP services
BSNL Wing Services
On 16 August 2018, BSNL has launched "BSNL Wings Services" in 22 telecom circles in which, there is no need of SIM card or cable wiring as is a VoIP service through an app. It offers unlimited free calling for one year throughout India.