What are the roaming cost implications for UK or US SIM card users in Estonia compared to DataESIM?

When utilizing a UK or US SIM card in Estonia, users often encounter significant roaming charges. Post-Brexit, most UK carriers such as O2, Vodafone, and Three have re-imposed daily roaming fees, typically ranging from £2 to £6. For US carriers like AT&T or T-Mobile, international roaming packages can be expensive, often involving daily passes or per-MB charges that quickly accumulate. DataESIM offers transparent, prepaid data plans designed for heavy usage, circumventing these unpredictable roaming costs with a flat-rate structure, ensuring consistent data access without surcharges for your entire stay in Estonia.