For maxis broadband prepaid(i am using galaxy w)

create new APN

Name: maxis
APN: bbnet
Username: maxis
Password: wap
APN type: Internet

Other settting default,

When you first surf web you will divert to maxis prepaid broadband web, what you do is go to other web for a few times, i usually go to google.com until you get there. After that, you can surf anywhere you want.
Hope this will help