I just bought one of these type of smart plugs, like 4 days ago, and it was a pain in the brain ( a major pita ) to get it to start working,
The PIN code not correct was annoying.
I did a manual update for hardware version A using my android, it might work on your Iphone/IOS, I don't know though,
or if all else fails sell the dsp plug for parts as not working.
How I got mine working
http://forums.dlink.com/index.php?topic=73116.0