Mobile internet has been growing pretty fast and some networks are already onto 4G technology. A big chunk of growth has undoubtedly been in the US which is now home to the largest number of 3G subscribers in the world.
Here are some interesting statistics
Number of 3G subscribers in USA : 117 million (18% of world)
33% of customers worldwide with the fastest 3G networks are from US
1 out of 5 new 3G subscribers being added are from US
USA has the most number of wireless hotspots : 70,000 – more than twice as much as the next country