A recent study shows European marketers are approaching mobile efforts slowly, reports ClickZ.

According to the Airwide-commissioned study, 71 percent of European brands say they will be spending at least 10 percent of their budgets on mobile efforts in the next two years. That would be up from 54 percent in 2006.

Only 28 percent of those marketers plan to use both SMS and MMS technology.

46 percent of companies say their caution in mobile marketing comes out of a fear of intruding on customers. Brands also seem unconvinced of mobile technology's reliability for ad delivery.