It's called Eye-Fi Here's their site ---> http://www.eye.fi/ If my Trophy cams were compatable, I could walk within 90ft of my camera, and it would upload the photos to my iPhone. I wouldn't even have to get my stink all over the camera or surrounding area I already use my AirStash to view my photos while in the stand on my phone, but I still have to swap cards. Man, the possibilites with technology.... Interesting stuff!
I have one of these in a Canon and it works as advertised. I upload them to my personal website almost instantly using my iPhone as the relay. Using one in a trailcam will be trial and error. It's also going to chew through the batteries......