Hi everybody,
Today I finish my first android application, and it's to "solve" this problem.
It's working for me, so:
1 - Do you need made with the SIM doesn't more changes the number, in my case, I access "Toolkit do SIM" on the menu of my phone. In this moment your problem doesn't more occur, but do you need put the operator code every time that you need make a call. If you put the operator code in all numbers, another problem occurs, you loose the identification on a receive call.
2 - Copy my app to your computer and unzip.
3 - Install the app
3.1 - Go to the folder that you save my app
3.2 - Connect your phone to the computer
3.3 - Use the "adb install Operadora.apk" to install in your phone
4 - Open the Operadora in your phone
5 - Select the checkbox to turn on
6 - Put the operator code that you want. Only 02 digits.
7 - Make a call to test. OBS. The call number must be 11 digits.
There are another app on the android market, but didn't work in my phone and I don't know why. But, this is the link: com.fett.android.Operadora