Ok I found something that works. I have a Otter box defender and its not horrible to take the case off but I don't want too. DO an eBay search for "8pin Male to Female Dock Extender Adapter" This works like a champ. Could not find any cables that were certified.
Sunpak USB 2.0 72-in-1 Card Reader Black 72-IN-1-CR - Best Buy Couldn't you just buy this $9 card reader at best buy and use your own iphone USB/lightning charging cable in the field?
I keep it simple, and just use my little Canon digital cam to check cards. It fits right in my pocket.
Since this thread is back from the dead may as well give a little update - the newer 3-in-1 card reader from Stealth Cam comes with a small lightning cable extension so no more taking your case off. It also works as a USB reader in your computer and with Android devices. Handy little sucker! I keep one in my truck and one in my camera bag at all times. https://www.stealthcam.com/triple-connection-memory-card-reader/