Kindle Touch Download Troubles?

I was helping a patron the other day download her book from ALD onto her Kindle Touch. The whole process on the computer went well but even after pressing Sync and Check for Items the book didn't show up. Her device is 3G but her wireless was not turned on. Once the wireless had been turned on the Kindle was able to Sync and pull the book from the Kindle Cloud. I would think that this would be the case for the Nook as well. So, the lesson I learned was: 3G AND Wireless need to be turned on inorder for the books to be successfully downloaded and read on the Kindle Touch. One other tid-bit: if the Sync and Check for Items doesn't download anything, try turning off the device and back on then waiting for a minute while the whole system starts back up to see if the book will show up.