Is roaming free in Singapore if I am using my UK or US SIM card?

It's highly improbable that you'd get free roaming in Singapore with a standard UK or US SIM card. Singapore is not part of any 'free roaming' agreement for most European or North American mobile networks. Post-Brexit, many UK carriers (like O2 or EE) have reintroduced daily roaming charges for non-EU countries, which can quickly become expensive. Similarly, US carriers often charge substantial daily passes or per-MB rates for international roaming. An EastESIM plan for Singapore, connecting you directly to reliable local networks like Singtel or StarHub, offers a much more predictable and budget-friendly way to stay connected in this dynamic city-state without incurring unexpected costs.