getAnnotations.m

// get a annotations for a feature

[client getAnnotationsForFeature:@"SG_7L9nQHjsporBjZUz8KVt5t"
                        callback:[SGCallback callbackWithSuccessBlock:
                                  ^(id response) {
                                      // you've got a annotations!
                                  } failureBlock:^(NSError *error) {
                                      // handle failure
                                  }]];