My test of a truly smartphone is 'could you go on a three day business trip and just take it, not your laptop?'
The launch of a T-Mobile phone with Google's Android mobile operating system is a key stage in the development of the corporate market for 'smartphones'. Whilst some corporates have used mobile devices for specialist applications they have not had a huge impact of general corporate applications - except of course e-mail, calendar, contacts and other MS Outlook type functions.
Having another big player in the market can only help the process of making smartphones a more credible replacement for laptops for people on the move.