No, yaySIM does not provide an unlimited data eSIM plan for Nauru. The available options are fixed data plans, each with a specific data allowance and validity period. For example, the NR_20_30 plan offers 20GB of data that can be used over 30 days for $51.54, while the NR_10_30 plan provides 10GB for 30 days at $34.32. These fixed plans tend to be more cost‑effective for most travelers, unless a user requires very high data consumption that would exceed the allotted amounts.