diff --git a/ios/RNFirebase/functions/RNFirebaseFunctions.m b/ios/RNFirebase/functions/RNFirebaseFunctions.m
index 2c84e239..2fe4e9d2 100644
--- a/ios/RNFirebase/functions/RNFirebaseFunctions.m
+++ b/ios/RNFirebase/functions/RNFirebaseFunctions.m
@@ -2,20 +2,106 @@
 
 #if __has_include(<FirebaseFunctions/FIRFunctions.h>)
 #import <FirebaseFunctions/FIRFunctions.h>
+#import <FirebaseFunctions/FIRHTTPSCallable.h>
+#import <FirebaseFunctions/FIRError.h>
 
 @implementation RNFirebaseFunctions
 RCT_EXPORT_MODULE();
 
 RCT_EXPORT_METHOD(httpsCallable:
-                  (NSString *)name
+                  (NSString *) name
                   wrapper:
-                  (NSDictionary *)wrapper
+                  (NSDictionary *) wrapper
                   resolver:
                   (RCTPromiseResolveBlock) resolve
                   rejecter:
                   (RCTPromiseRejectBlock) reject
                   ) {
-    // TODO
+    FIRFunctions *functions = [FIRFunctions functions];
+    
+    [[functions HTTPSCallableWithName:name] callWithObject:[wrapper valueForKey:@"data"] completion:^(FIRHTTPSCallableResult * _Nullable result, NSError * _Nullable error) {
+        if (error) {
+            NSObject *details = [NSNull null];
+            NSString *message = error.localizedDescription;
+            if (error.domain == FIRFunctionsErrorDomain) {
+                details = error.userInfo[FIRFunctionsErrorDetailsKey];
+                if (details == nil) {
+                    details = [NSNull null];
+                }
+            }
+            
+            resolve(@{
+                @"__error": @true,
+                @"code": [self getErrorCodeName:error],
+                @"message": message,
+                @"details": details
+            });
+        } else {
+            resolve(@{ @"data": [result data] });
+        }
+    }];
+    
+}
+
+- (NSString *)getErrorCodeName:(NSError *)error {
+    NSString *code = @"UNKNOWN";
+    switch (error.code) {
+        case FIRFunctionsErrorCodeOK:
+            code = @"OK";
+            break;
+        case FIRFunctionsErrorCodeCancelled:
+            code = @"CANCELLED";
+            break;
+        case FIRFunctionsErrorCodeUnknown:
+            code = @"UNKNOWN";
+            break;
+        case FIRFunctionsErrorCodeInvalidArgument:
+            code = @"INVALID_ARGUMENT";
+            break;
+        case FIRFunctionsErrorCodeDeadlineExceeded:
+            code = @"DEADLINE_EXCEEDED";
+            break;
+        case FIRFunctionsErrorCodeNotFound:
+            code = @"NOT_FOUND";
+            break;
+        case FIRFunctionsErrorCodeAlreadyExists:
+            code = @"ALREADY_EXISTS";
+            break;
+        case FIRFunctionsErrorCodePermissionDenied:
+            code = @"PERMISSION_DENIED";
+            break;
+        case FIRFunctionsErrorCodeResourceExhausted:
+            code = @"RESOURCE_EXHAUSTED";
+            break;
+        case FIRFunctionsErrorCodeFailedPrecondition:
+            code = @"FAILED_PRECONDITION";
+            break;
+        case FIRFunctionsErrorCodeAborted:
+            code = @"ABORTED";
+            break;
+        case FIRFunctionsErrorCodeOutOfRange:
+            code = @"OUT_OF_RANGE";
+            break;
+        case FIRFunctionsErrorCodeUnimplemented:
+            code = @"UNIMPLEMENTED";
+            break;
+        case FIRFunctionsErrorCodeInternal:
+            code = @"INTERNAL";
+            break;
+        case FIRFunctionsErrorCodeUnavailable:
+            code = @"UNAVAILABLE";
+            break;
+        case FIRFunctionsErrorCodeDataLoss:
+            code = @"DATA_LOSS";
+            break;
+        case FIRFunctionsErrorCodeUnauthenticated:
+            code = @"UNAUTHENTICATED";
+            break;
+        default:
+            break;
+    }
+    
+    return code;
 }