diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index f7cdc2b..ac5591e 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -14,7 +14,7 @@
 
 # Uncomment this to preserve the line number information for
 # debugging stack traces.
-#-keepattributes SourceFile,LineNumberTable
+-keepattributes SourceFile,LineNumberTable
 
 # If you keep the line number information, uncomment this to
 # hide the original source file name.
@@ -30,3 +30,7 @@
 -keepclassmembers class * extends org.greenrobot.eventbus.util.ThrowableFailureEvent {
     <init>(java.lang.Throwable);
 }
+
+-keep class com.android.internal.telephony.ITelephony { *; }
+
+-dontobfuscate