Cannot connect to 0.16 PC server from 0.15.10 iPhone MPCE

I had an MPCE update forced on my PC via the Windows Store. This updated me to 0.16.0. But now the shared world that we run off the PC is inaccessible to our iPhones which still have 0.15.10. The world is listed but attempting to connect just results in a permanent 'Locating server'. My wife and kids are really annoyed.