For that who have this same problem, i would like to register the cause and the workaround i found:
The problem happens when your SIM chip automatically changes the dialed number (ex: to merge the operator code in the number for distance calls). In this case, when you make a call, you will receive the message "Number changed by SIM: xxxxx" in the screen. After this, your screen won´t lock anymore.
I presume this is a bug in Android. Is there some ideal place to report it?
Regards,
Fabiano
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