I'm guessing you're transferring recordings from the onboard SD card?
It will be awful slow over wifi, the only realistic way to review recorded video is either take out the mini SD card and download to a computer probably through adapter of some kind,  or connect the phantom directly to computer by USB.  Recording at highest resolution even 2 or 3 minutes will be several GB - very large video files.

Unless you disabled it there will be a low res version saved on your device you can review.