Orange Terms and Conditions regarding data fair usage:
Mobile internet browsing is for use within the UK only. Any use outside the UK will be charged at the relevant international rates. Mobile Internet browsing does not include event charges such as for ringtones or games (transport costs for these events are included). Fair Usage policy of 750MB applies. Usage above this amount will constitute abuse and Orange may monitor usage, apply Network protection controls which may result in reduced speed of transmission and/or withdraw the Offer from your account if the fair usage policy is abused.