This from a study called "Unsafe driving behaviour and four wheel drive vehicles: observational study" that was published in the British Medical Journal:
Drivers of four wheel drive vehicles were more likely
than drivers of other cars to be seen using hand held mobile
phones (8.2% v 2.0%) and not complying with the law on seat
belts (19.5% v 15.0%). Levels of non-compliance with both laws
were slightly higher in the penalty phase of observation, and
breaking one law was associated with increased likelihood of
breaking the other.
Conclusions The level of non-compliance with the law on the
use of hand held mobile phones by drivers in London is high,
as is non-compliance with the law on seat belts. Drivers of four
wheel drive vehicles were four times more likely than drivers of
other cars to be seen using hand held mobile phones and
slightly more likely not to comply with the law on seat belts.