System/Library/PrivateFrameworks/CallHistory.framework
CHFeatureFlags.h
@class NSString;
@interface CHFeatureFlags : NSObject <CHFeatureFlags>
@property (readonly, nonatomic) BOOL increaseCallHistoryEnabled;
@property (readonly) unsigned long long hash;
@property (readonly) Class superclass;
@property (readonly, copy) NSString *description;
@property (readonly, copy) NSString *debugDescription;
@end