Yes, there is 3G most places, and 3.5G in and around most cities.
Both Smart and Globe have good coverage, but Sun is mostly Manila / Luzon based regarding 3G and 3.5G.
Sun has awesome 3G / 3.5G unlimited internet. Both in speed and price.
If my DSL fails or I am not at home, I use Globe. Only if that is too slow, I try Smart.
It all depends on the carriers coverage in our area, of course.