O2 is one of the few networks to still offer inclusive roaming in 47 European destinations.
O2 customers can use their allowances for free in these locations:
Austria
Azores
Belgium
Bulgaria
Canary Islands
Croatia
Cyprus
Czech Republic
Denmark
Estonia
Finland
France
French Guiana
Germany
Gibraltar (UK)
Greece
Guadeloupe
Hungary
Iceland
Ireland
Italy
Latvia
Liechtenstein
Lithuania
Luxembourg
Madeira
Malta
Martinique
Norway
Poland
Portugal
Reunion Islands
Romania
Saint Barthelemy
Saint Martin (French)
San Marino
Slovakia
Slovenia
Spain
Sweden
The Netherlands
Vatican City
Free roaming in destinations outside the EU/EEA, such as Guernsey, Isle of Man, Jersey, Monaco and Switzerland are also included for O2 customers on monthly contracts and business contracts.
O2's free roaming is intended for customers who are visiting any of the above countries for a short holiday or business trip.
Customers who use roaming in the Europe Zone for a prolonged period of time are likely to exceed O2's fair usage policy and may incur further charges. O2 uses the example of roaming for 60 days or more in a four-month period as being beyond reasonable holiday and travel patterns and will therefore fall outside of the fair usage policy.
O2 has said that using roaming for an extended period of time will be judged on a case-by-case basis. Customers are encouraged to notify their provider before they travel.
O2 doesn't impose a data cap for roaming in the Europe Zone for any of its pay monthly, pay and go and business customers.
Pay as you go customers on the £30 Big Bundle tariff, however, will be able to use up to 10GB of their 20GB allowance while roaming in the Europe Zone.