I may be oversimplifying this, but your mobile connection may be turned off. The easiest way to check is to hold down your power button as if you were going to power your phone off, and "Mobile Connection" should be at the bottom of the menu the pops up.
I've got the same problem. Granted, I have a rooted eris running GSB v1.9, but it's worked for me thus far (almost 3 weeks), but now all the sudden the 3g symbol wont even show up to communicate. this prevents me from being able to even send a text message. Please help!
I've tried reflashing both the ROM and GAPPS and I even restored back to a point when it was working, and it still didnt communicate!!!! I then proceeded to wipe the factory/data settings AND dalvik cache, with no success.
My "Mobile Network" is ON. and iv tried everything, restarting everything on my phone, battery pull, everything. I have three bars right now but no 3G or anything like that. I cannot go on the internet without wifi so when i am not at home i cannot get on the internet even though i paid for the data package. Do i need to download anything on my phone to make it work?