Nextel blackberry web?

I have nextel service and want to stay that way i have a normal flip phone and i use the mobile web, the problem is that its only the "mobile" web i want to know if the black berrys pda phones have a wider or full access to the internet so i can view anything not just mobile web websites have thought about getting a laptop to carry with me while i am working just so i have the web but would like to know if i can get that on my phone instead