Apparently it was a carbon based interface error.
It took five attempts to connect via the 3G on my iPad just now, but I did connect. The iPad is the device we were using to test it last night. After each failed attempt he changed the port. I'll test from work tomorrow to see if I get a more reliable response from a computer outside our network.
The notes he's left on the table do indicate that I need to use a different address to access from outside our network: but I mixed that up. That part was my fault.
Edit: We're so convinced that Telus is the Devil that we blame them for everything.
