I got curious and had a look in the Wi-Fi manual for the 70D.
It's not at all similar to the Ethernet capabilities you find in the 1DX or 7D, for example, but totally revamped. The 1DX allows the photographer to push all or selected images to a computer, from the camera. Or you can configure the camera to serve a browser with the images in the camera, and then you can pull images to the computer/phone client from the server.
As far as Smartphone connection to the 70D goes, it seems you can't transfer images from the camera to the phone, but you rather use the phone and pull images from the camera to the phone.
Prior to doing that, you have to establish which images to see, since those that are invisible can't be pulled. There are different possibilities for determining which images are visible, like taken after a certain date, being within a range or those that are rated with a certain rating.
Maybe the rating concept is the one you should use?