Merdata does not provide an unlimited data eSIM for Bulgaria; none of its offers list a data cap of “unlimited.” Instead, merdata sells fixed data plans that give a set allowance—currently the largest available is 50 GB. These plans vary in validity: for example, a 50 GB plan lasts 31 days or, for travelers who want a longer period, a 50 GB plan lasts 180 days. While each plan has a fixed data allowance, choosing a fixed‑data plan can often be more cost‑effective for users who need a substantial amount of data but are not extremely heavy data consumers, as it removes the uncertainty of paying per usage.