[Samsung Epic 4G Touch] Goddly:
Your problem is quite simple, you are on a "Jelly Bean" rom, which requires a "JB" modem for proper data functionality ,

Post #4 "how to flash a modem" upgrade to a JB modem, recomend GB27 , as it works wonders for me...

I'm 100% certain this will clear up your issue.... -Goddly

---------- Post added at 03:20 PM ---------- Previous post was at 03:18 PM ----------

How to Flash a Modem

This is if you need to know how to flash a JB modem. Really, there are two ways to accomplish this. One is with PC odin and the other is flashing in a recovery. We will start with PC odin first. use the link below for where to get the modem.....JB modem. Download a JB modem which is FK23 - GB08. ll of them will work, some better than others. I recommend downloading a One-Click (OC) modem and while you are there download a Zip version as well.

Odin / PC Once the OC odin is download open it up as administrator and put your phone in download mode. once you hook your phone up to the PC you will see a yellow [COM:] box. this means you are connected and ready. So now all you have to do is hit the start button. Let it run and finish......it will take about 3-5 mins. It will auto-reboot your phone when it is finished. Now all you have to do is update profile and PRL and your good.

Flash modem in CWM For those without access to a PC there is a little trick to getting the modem to flash. You're going to need mobile odin, EL26+CWM zip, the modem zip and GB27 kernel zip. Links are provided below. Now, here's the steps

Step 1) Flash EL26+CWM zip

step 2) Once the phone starts to reboots hold power and volume up (at the same time) to get into recovery (if you miss your chance. pull the battery. Put the battery back in and hold power+volume down at the same time and try again.)

step 3) This puts you in EL26 recovery. Navigate to modem.zip you downloaded earlier and flash it

step 4) once the modem is finished flashing, wipe, cache and delvik cache. Then flash GB27 Stock kernel. You need to do this to be able to boot back into the ROM.

step 5) when its all done......reboot phone.

If done properly you will have your baseband show the modem you flashed. You will have data now on a JB ROM. Just make sure to update profile and PRL once its booted up. Either one of these methods will work and you can flash different JB modems to see which one works better. For me personally, GB08 and GB27 modem works the best.

---------- Post added at 03:51 PM ---------- Previous post was at 03:20 PM ----------

1#Download and Install-----Mobile Odin ---, http://xdaforums.com/showthread.php?t=1347899

Its an app, (Google play) install, grant SU (superuser)...

Download -----	StockCWM-EL26.tar.md5 - http://www.rwilco12.com/downloads.p...ls/Recovery Kernels/GB/Chris41g/Stock CWM/TAR

Download ----- https://www.dropbox.com/s/f2pbfjssyg7nifg/GB27_JB_STOCK_KERNEL_NOCWM.zip

My own drop box, couldnt find the proper .zip in the rwilco repository

Download ----- GB27 modem.zip ive tried to find it , but its not in the repository either, and i have a dentist appointment to get to,

open mobile odin scroll down to "open file" point to wherever you put the downloads , sdcoard external, internal then open the el26.tar, then scroll down to "flash Firmware" hit yes yes .. warnings etc.. then after your phone will reboot... now hold the power button and vol ? to get into recovery, once in recovery flash the GB27 Modem .zip file.... after that flashes, Flash the GB27 Stock Kernel.zip... reboot and done....................................