I have a Telcel (Mexican carrier) 9700 I bought on Ebay running a T-Mobile SIM and all is well AFTER I got UMA working by following these instructions:
Problem is that getting into the Engineering Screen takes MANY tries entering the key that's generated, it will work after reboots, battery pulls, etc. (not sure why?) but it's a real PITA!
If I update the OS, all the information entered in the engineering screen is lost. I suspect this is because the Telcel phone doesn't have the correct firmware?
Is there a way to make the information stick? I doubt it, so is there an easier way to enter the Engineering Screen? Last, when I update to 5.0.0.680 the number in parentheses becomes 4 digits and that apparently results in generating a bad code because I absolutely cannot enter the Engineering Screen after the upgrade so, again, any other way to get to the Engineering Screen?
Other than trading my 9700 for a T-Mobile 9700 is there any solution? I know better than to ask about rebranding the phone...
Now I'm even more confused, I updated again to 5.0.0.680 and entered the engineering screen on the first try! I've spent two days trying to get there with 680 before, what's going on????
