My Nokia never comes out of my pocket and it bluetooths quite happily from there for calls, contacts, etc.
The only glitches so far are:
- the contacts bit of visual boost only picks up numbers stored in 'mobile' category in the phone and won't display them if stored under 'telephone' or 'land' etc;
- battery needs to be reasonably well-charged or the phone doesn't make bluetooth connection - less than three bars out of six means no bluetooth.