[G3 Q&A, Help & Troubleshooting] OneLuffy1985:
Here my logcat when I try to send MMS but now I have not the message error, but back to the homepage of the app and nothing happen.

06-01 21:48:06.971 E/Mms (32555): WorkingMessage.send MMS sending failure. mms_config.xml is missing uaProfUrl setting. uaProfUrl is required for MMS service, but can be absent for SMS.
06-01 21:48:06.971 E/Mms (32555): java.lang.NullPointerException: WorkingMessage.send MMS sending failure. mms_config.xml is missing uaProfUrl setting. uaProfUrl is required for MMS service, but can be absent for SMS.
06-01 21:48:06.971 E/Mms (32555):	at com.android.mms.data.WorkingMessage.send(WorkingMessage.java:1277)
06-01 21:48:06.971 E/Mms (32555):	at com.android.mms.ui.ComposeMessageActivity.sendMessage(ComposeMessageActivity.java:4799)
06-01 21:48:06.971 E/Mms (32555):	at com.android.mms.ui.ComposeMessageActivity.confirmSendMessageIfNeeded(ComposeMessageActivity.java:1028)
06-01 21:48:06.971 E/Mms (32555):	at com.android.mms.ui.ComposeMessageActivity.onClick(ComposeMessageActivity.java:4255)
06-01 21:48:06.971 E/Mms (32555):	at android.view.View.performClick(View.java:4781)
06-01 21:48:06.971 E/Mms (32555):	at android.view.View$PerformClick.run(View.java:19873)
06-01 21:48:06.971 E/Mms (32555):	at android.os.Handler.handleCallback(Handler.java:739)
06-01 21:48:06.971 E/Mms (32555):	at android.os.Handler.dispatchMessage(Handler.java:95)
06-01 21:48:06.971 E/Mms (32555):	at android.os.Looper.loop(Looper.java:135)
06-01 21:48:06.971 E/Mms (32555):	at android.app.ActivityThread.main(ActivityThread.java:5343)
06-01 21:48:06.971 E/Mms (32555):	at java.lang.reflect.Method.invoke(Native Method)
06-01 21:48:06.971 E/Mms (32555):	at java.lang.reflect.Method.invoke(Method.java:372)
06-01 21:48:06.971 E/Mms (32555):	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:911)
06-01 21:48:06.971 E/Mms (32555):	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
06-01 21:48:06.971 D/AndroidRuntime(32555): Shutting down VM
06-01 21:48:06.971 E/AndroidRuntime(32555): FATAL EXCEPTION: main
06-01 21:48:06.971 E/AndroidRuntime(32555): Process: com.android.mms, PID: 32555
06-01 21:48:06.971 E/AndroidRuntime(32555): java.lang.NullPointerException: WorkingMessage.send MMS sending failure. mms_config.xml is missing uaProfUrl setting. uaProfUrl is required for MMS service, but can be absent for SMS.
06-01 21:48:06.971 E/AndroidRuntime(32555):	at com.android.mms.data.WorkingMessage.send(WorkingMessage.java:1277)
06-01 21:48:06.971 E/AndroidRuntime(32555):	at com.android.mms.ui.ComposeMessageActivity.sendMessage(ComposeMessageActivity.java:4799)
06-01 21:48:06.971 E/AndroidRuntime(32555):	at com.android.mms.ui.ComposeMessageActivity.confirmSendMessageIfNeeded(ComposeMessageActivity.java:1028)
06-01 21:48:06.971 E/AndroidRuntime(32555):	at com.android.mms.ui.ComposeMessageActivity.onClick(ComposeMessageActivity.java:4255)
06-01 21:48:06.971 E/AndroidRuntime(32555):	at android.view.View.performClick(View.java:4781)
06-01 21:48:06.971 E/AndroidRuntime(32555):	at android.view.View$PerformClick.run(View.java:19873)
06-01 21:48:06.971 E/AndroidRuntime(32555):	at android.os.Handler.handleCallback(Handler.java:739)
06-01 21:48:06.971 E/AndroidRuntime(32555):	at android.os.Handler.dispatchMessage(Handler.java:95)
06-01 21:48:06.971 E/AndroidRuntime(32555):	at android.os.Looper.loop(Looper.java:135)
06-01 21:48:06.971 E/AndroidRuntime(32555):	at android.app.ActivityThread.main(ActivityThread.java:5343)
06-01 21:48:06.971 E/AndroidRuntime(32555):	at java.lang.reflect.Method.invoke(Native Method)
06-01 21:48:06.971 E/AndroidRuntime(32555):	at java.lang.reflect.Method.invoke(Method.java:372)
06-01 21:48:06.971 E/AndroidRuntime(32555):	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:911)
06-01 21:48:06.971 E/AndroidRuntime(32555):	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)