Is roaming included for France if I have a UK or US SIM card?

This largely depends on your home carrier and country of origin. If you're from the UK post-Brexit, many major UK carriers such as Vodafone, O2, and Three have reintroduced daily roaming charges for European travel. For US carriers, international roaming packages are often expensive. An eSIM Trails plan offers a predictable, cost-effective alternative to avoid these variable and often high fees, giving you clear-cut data costs for your French journey without hidden surprises.