Will my existing UK or US SIM card allow free roaming in Lithuania, or is CheapESIM a better value?

For EU citizens, 'Roam Like at Home' generally applies in Lithuania. However, for UK and US travelers, roaming with your home SIM is almost certainly not free and can be very costly. Post-Brexit, most UK carriers (e.g., O2, Vodafone) charge daily fees, often £2-£6. US carriers (AT&T, Verizon, T-Mobile) offer international passes for $10-$15 per day. CheapESIM provides significantly better value, offering data plans for a fraction of these daily costs, often saving you over 80% on data expenses. It's a clear winner for budget-conscious travelers.