I quote myself when I said in my Samsung Champ review that
The Samsung Champ is capable of connecting to the Internet and has made social networking a breeze, they say, BUT unfortunately Sun Cellular doesn’t have configuration support yet for this phone model. That means I am not yet able to enjoy the Internet powers of my Champ.
I got that information from the customer service hotline of Sun Cellular. Unfortunately, she is wrong.

I don’t have any manual settings to show here on how you can activate the GPRS on your Samsung Champ. What I did is I went to the Sun Shop in Ayala Center Cebu (you can do so in any Sun Shop nationwide) and asked the customer representative to activate my phone’s Internet. She told me to wait for 24 hours before activation and actually it took almost 48 hours for the Internet to get activated.
So again, to enable Internet or GPRS on your Samsung Champ, go to the nearest Sun Shop and ask them to activate for you. All you have to do is wait. Enjoy!
P.S. I think the Sun Cellular hotline is less trustworthy than those from the Sun Shop. So without hesitation, visit your nearest Sun Shop.