Sao Tome and Principe, a small island nation in Central Africa, has a growing telecommunications sector that is playing an essential role in the country’s connectivity. With a population of around 223,000 people, the number of mobile phone users is steadily increasing, reaching about 200,000 subscribers. This indicates that mobile penetration is nearing 90%, showing the widespread use of mobile phones across the islands. USSD has gained popularity in Sao Tome and Principe, particularly for services like mobile banking, airtime top-ups, and checking balances. Some of the most popular USSD codes include *123# for balance checks and *100# for accessing mobile services from the leading telecommunications providers. The use of WhatsApp and SMS for marketing purposes is growing in popularity in Sao Tome and Principe. Businesses are leveraging these platforms to reach their customers directly, offering promotions, updates, and customer service.