How about my samsung galaxy note shv e160l can you fix it?. .signal keeps going on and off. .and even when the signal bar is full most of the times i cant make calls or text. .it just says "connection problem or invalid mmi code". .whats the problem?. .the sim is good because itvworked on another phone. .and a new sim card still works as my sim card even if works on other phone. .i am not a tech guy so i dont know what to do. .i am really getting frustrated. .please help. .