nextSIM does not provide a truly unlimited high‑speed data plan for Guinea. The plans that carry “Unlimited” in their name actually grant a fixed amount of high‑speed data—such as 1GB per day on the 1‑day Standard plan or 2GB per day on the Plus plan—and once that amount is reached the connection slows to a reduced speed, ranging from 512kbps to 2000kbps.
If you need more data, nextSIM offers fixed‑data alternatives. For example, the eSIM 10GB plan is valid for 30 days and costs $141.07 USD, and the eSIM 5GB plan is also valid for 30 days at $76.66 USD. These plans may be more cost‑effective for travelers who consume a large amount of data in Guinea.