OSC and mobile (ios specifically)

I can communicate just fine with OSC from unity to other apps on the same computer or a different computer but I have been unsuccessful trying to get a build of my app running on my iphone to send OSC to a computer.

Does anyone know how to do this/point me in the right direction? I've been using this plugin http://thomasfredericks.github.io/UnityOSC/ I set the out IP to the computer I wish to speak to, and set the corresponding port numbers (so say outport to 8001 and then in the application on my computer I set it to receive from 8001).

But nothing is happening. Any help much appreciated.