My new iPhone 4's mobile data Internet is slow?

Well this is my new iPhone 4, and whenever I'm at school outside on the field, my Internet takes like 2 minutes to load! Even more than that, I have my 3G on and it's a brand new phone. I don't see a problem! My mobile data works but its slow?

A lot of times it's your carrier that cause the Internet to be slow

That just reception. You didn't mention what carrier you have. I've heard Sprint is the worse. But it depends where you are. Every carrier is different and vary by location. You should try another carrier and see if it's better. If if bothers you that much.