diff --git a/node_modules/react-native/React/CoreModules/RCTTiming.mm b/node_modules/react-native/React/CoreModules/RCTTiming.mm
index 7517771..5af8bdc 100644
--- a/node_modules/react-native/React/CoreModules/RCTTiming.mm
+++ b/node_modules/react-native/React/CoreModules/RCTTiming.mm
@@ -148,6 +148,11 @@ - (void)setup
                                                  name:name
                                                object:nil];
   }
+
+  [[NSNotificationCenter defaultCenter] addObserver:self
+                                           selector:@selector(proximityChanged)
+                                               name:UIDeviceProximityStateDidChangeNotification
+                                             object:nil];
 }

 - (void)dealloc
@@ -184,6 +189,16 @@ - (void)appDidMoveToForeground
   [self startTimers];
 }

+- (void)proximityChanged
+{
+  BOOL isClose = [UIDevice currentDevice].proximityState;
+  if (isClose) {
+    [self appDidMoveToBackground];
+  } else {
+    [self appDidMoveToForeground];
+  }
+}
+
 - (void)stopTimers
 {
   if (_inBackground) {