Thanks to help from Basil I know the what and the why of the failure. It’s failed and restarted once, then failed again. If it starts next time I offer thanks, and know what to avoid: but I am not trying a that until I sort out what to do if it is now junk. 

One consequence of only having this Stone Age iPhone is that using Facebook is very slow, so slow that I’ve given up on it for the present. I appear on it thanks to this blog being on autopost, and messages get passed on to me, but I’ll not be interacting on it for a while.