Yes you can using Roaming, however this will cost (I think new regulations means that once you have spent £40 O2 stop you from spending anymore). Of course you can connect to WiFi and use it just like you would in the UK.
That is interesting that some carriers are forced to avoid overcharging their customers. AT&T doesn't do that, their roaming charges for data are insanely high.
Yes you can using Roaming, however this will cost (I think new regulations means that once you have spent £40 O2 stop you from spending anymore). Of course you can connect to WiFi and use it just like you would in the UK.