Grameenphone is the largest mobile operator in Bangladesh with over 50 million subscribers. It is a joint venture between Teleport and Grameen Telecom Corporation. Grameenphone was the first to introduce GSM technology and established the first 24-hour call center in Bangladesh. It offers both prepaid and postpaid mobile services as well as internet, bill pay, and other services. Grameenphone has invested heavily in its network infrastructure and has over 8,000 base stations covering 99% of the population. It also runs various corporate social responsibility initiatives focused on education, healthcare, and connecting rural communities.