Hi, when trying to play Minecraft with my son, we get "unable to connect to world" all the time.  

There are no details, no instructions, no hints or ideas on what to do.

im using a new iPhone, we have 1GB up/down fiber internet.

we've tried restarting, re-adding friends, even rebooting the device. 

We've updated the software to the latest version. 

This has worked before, so I'm out of clues on what to do to make this work.

if this is a user error on my side, the this report should be that it's not at all clear what users need to do to fix this. A more useful error message could do wonders.