ByteSIM does provide unlimited data plans for travelers in the United Kingdom. Two specific unlimited options exist: a 10‑day plan priced at $33.90 USD and a 30‑day plan priced at $69.90 USD. Both include tethering and are eligible for 4G or 5G coverage, but the provider notes that speed may be throttled after heavy usage, a common Fair Usage Policy applied to unlimited plans. If a user is concerned about potential speed restrictions or wants to confirm the exact amount of data that can be downloaded at normal speed before throttling applies, it is advisable to contact ByteSIM directly for clarification.