While the concept of a truly "free data" Tanzania eSIM plan that offers unlimited service without any conditions is generally not available, some providers offer limited free data as an introductory offer or for specific, short-term uses. For example, some eSIM providers might offer a small amount of data (e.g., 100MB) for free to allow you to test their service or for emergency connectivity upon arrival. Providers like Roamless, GigSky, and Firsty are known to occasionally provide such introductory or limited free data options, often tied to a trial period or a specific promotional campaign when traveling to Tanzania.
However, for sustained internet access during your trip to Tanzania, you will need to purchase a paid Tanzania eSIM plan. These plans offer varying data allowances and validity periods to suit different travel needs, from short safaris to extended stays. It's always advisable to check the specific terms and conditions of any "free" offer, as they typically come with limitations on data volume or duration, and they are not a substitute for a comprehensive data solution.