I've just dumped my iPhone for a Nokia 5310. Same sim and it appears to be mostly fine - make and receive calls, everything showing up in recent usage in my account correctly - except if I try to do anything that requires a net connection it informs me I need to enable data roaming.
Is this true? I don't want to roam here in the UK or abroad. The phone settings for mobile data are set to on and the options for APN are set to Virgin Media Internet as expected. There's also an R just above the signal bars, if that's relevant.
I did a short test where I enabled roaming and used the browser to access a few pages - everything worked fine, though I don't know how long it will be until I find out if I've been charged for the data through another network. I have disabled roaming again until I work out what's happening.