Yes, abesteSIM provides several unlimited‑data eSIM options for Montenegro. These plans differ in validity periods—from 1 day to 30 days—and in price, ranging from about $3.26 USD for a single‑day plan to $84.94 USD for a 30‑day plan. All unlimited plans state that speed may be throttled after heavy usage, consistent with a fair‑usage policy. If a traveller prefers a higher maximum speed, abesteSIM also offers plans with a for‑use‑day rate that cap the speed at 5Mbps or 10Mbps, but the amount of data remains unlimited. For the full details on pricing, validity, and the specifics of any speed restrictions, it is advisable to contact abesteSIM directly.