As a suggestion, if you have a friend or family member with another device, like maybe an Android Phone or tablet, or even another iPhone. Try to connect with one, see if it works. Make sure they install the correct app iN-Command version, the current one is the Global Connect one, it has the Global Connect Logo on the wall display as well.
Bluetooth connectivity is often a difficult thing to do. By the way, it never uses Wifi to connect to the main module.
I am an Android user, but my wife is all on Apple only products, and they will often not play well with others....
Good luck.