"Connection Problem or Invalid MMI Code" .. help plz - Galaxy S II Q&A, Help & Troubleshooting

hi guyz i have an annoying problem with my SGS2 ( jb 4.1.2 stock kernel no root )
the problem is that SOMETIMES NOT ALWAYS when I make calls I got this msg
"Connection Problem or Invalid MMI Code" and I have to reboot my device to fix it
help plz .. sry for my bad english

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I solved my problem
hoseyni- said:
I solved my problem
Click to expand...
Click to collapse
It might help others if you said how you solved it.
answer
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