The amount you can save with an eSIM varies depending on the destination. For example, you could save up to £158.49 in the USA, £181.11 in Japan, £194.75 in India, £43 in Italy, £188.50 in Brazil, £36.15 in Spain and £163.46 in Australia using an international SIM card.  The savings are achieved by purchasing local eSIM deals instead of paying for your UK provider's roaming costs.