It looks like i lost my 599 plan!?! yesterday my phone started displaying the message on edge. "Current plan not compatible with this device. please click here to view plan options".
I haven't run specifically into this issue but it should be fixable. You'll need to check out the stickies by spookyET and the tzones patch one. I use the 10 dollar data plan for my phone. All I had to do was go to mytmobile.com and set my device to a shadow then select the shadow unlimited data. I then upload spooky's legacy bundle according to the instructions in that thread. It works fine. Whatever you do, don't press that update button...it will yank you out of that grandfathered tzones plan and start charging you 30 bucks a month.