If you've got an iPhone running iOS 9, then their Lightning to SD card adapter will work to import photos on the go.
http://www.apple.com/shop/product/MJYT2AM/A/lightning-to-sd-card-camera-reader
Alternatively, you could use a WiFi SD card. I prefer the Toshiba FlashAir, as you can connect to it with your phone and only transfer the images you want, similar to how WiFi in my XT-1 works. The downside of the WiFi SD card is that your battery life will suffer.
Sent from my iPhone using Tapatalk