Hi there, I've had the Thunderbolt for about a week now. I've been having the data connection problems like everyone else, especially right after I end Internet Connection Mode.
I did all the fixes, like factory reset, dialing the *#*#4636#*#* and the ##778 options, but to no avail. I can only guess it's the network that's having problems. I live in Spokane, WA and I know that they're probably testing out 4G in the area, so this might be the reason why the phone may be having connection problems.
But what should I do? What will happen when 4G turns on and yet my phone still has the connection problems? Will I be out of luck, since I'll be out of my 14 day return window? Overall, I still like the phone, but I don't want to keep it if there's somthing wrong with the phone itself.