3g Internet Stopped Working

This phone is a Sumsung Galaxy Proclaim   Out of nowhere my phone stopped allowing to access to the internet. I have tried a few things such of reactivating it, turning it off then back on, removing the battery and even keeping it on. Whenever I go into settings it shows that my data plan is active. Everything else works for the phone right now including the wifi, texting, calling and even the apps. I'm clueless as to why this would happen and I'm getting next to no help on the straight talk forum. So any help here would be greatly appreciated.