Have discovered this issue with 2705 daily build.
When building to xCode simulator in daily build 2705 the app produces an LUA error saying that network is nil. Its failing at a network.request().
I have built the exact project on the same build to my device and it all works, also works in corona simulator.
Using the latest public build, i was able to build the same project to xCode simulator with no issues.
Looks like an issue with 2705. Seems that 2705 is quite a buggy build.