To test, I took the example code grocerySync. I ran with the the way it is on my iPhone. It did run without any issue. I change to to our sync gateway server, but it is not pulling data. It is able to push to backend server. I can see those documents. Lastly, when I run the sync gateway server locally on my mac, It is able to push and pull the documents and its content to simulator. Below is the log when I run in my iPhone. It looks to pull, but nothing happens.
2015-06-08 13:34:49.765 GrocerySync[1359:284846] SYNC idle
2015-06-08 13:34:49.766 GrocerySync[1359:284846] SYNC idle
2015-06-08 13:34:49.766 GrocerySync[1359:284846] Application windows are expected to have a root view controller at the end of application launch
2015-06-08 13:34:49.911 GrocerySync[1359:284846] SYNC progress: 0 / 0
2015-06-08 13:34:49.915 GrocerySync[1359:284846] SYNC progress: 0 / 0
2015-06-08 13:34:49.964 GrocerySync[1359:284846] SYNC progress: 0 / 0