I got trigger trap. It works well, but I don't like to use it.
The problem is that you need to leave your phone on the camera for, potentially, hours. I generally want to use my phone in that time, and it is completely dedicated as a time-lapse controller or intervalometer. It drains your battery because the phone's screen has to stay on.
The last time I used it I remember setting up a nighttime star trails in winter. There was some crunchy, icy snow on the ground, and my selected location was on an old dilapidated bridge over a small creek. It was a railroad-style bridge, so the gaps between the ties were quite wide. Between the darkness, the icy and slippery snow, and the rotting bridge, I was a bit nervous out there. I slowly walked out onto the bridge and squatted down to setup the tripod. Then I had to get my phone out of my pocket and attach the dongle to the phone and camera. Squatting in the snow on the bridge over the pitch-black water, I configured the intervals. Then I went to put the phone down. The coiled bungee-cord-like wire wasn't long enough to set the phone down on the railroad tie. I could let it hang, but then if it came detached from the headphone connector the phone would probably fall into the creek. I was able to lean it against one of the tripod legs. Then I carefully retraced my steps back off the bridge. I think I let it run for an hour and a half. The whole time I was paranoid that the phone fell off and into the creek. When I finally could take it no longer, I carefully walked back onto the bridge. I was worried that the vibration of my steps would knock it in to the river. It was still there. The image worked okay (I haven't shown it because it just wasn't that amazing).
When these dedicated, third-party intervalometers are so cheap, I have trouble wanting to use my phone.
http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Delectronics&field-keywords=fotodiox%20intervalometer Are you using it as an intervalometer or for motion detection, lighting trigger, etc... I haven't messed with the other triggers much, but I found it to be a bit finicky with motion detection and sound triggering. I hate things that are finicky when I am trying to make pictures.
