[adders]

The Three changes came in response to this change in regulations.

As a relatively new operator they have always hated roaming, as it has made them less then the established operators.

[hav]

I'd actually argue that Three has been in a good position to introduce free roaming as they are active in a few European markets. I'm not sure when they go from being new to established though, as I first recall seeing them sometime around 2000.