Late yesterday evening, I bit the bullet and backed everything up to Windows using HiSuite. I then did a factory reset on the phone, followed by a restore of the backups. The good news is that the original problem (described in another post - "When calling voicemail, screen goes blank, I cannot choose any options, can only force a power off") is resolved. The bad news is that of my 120 apps which HiSuite backed up, less than half were successfully restored, so I'm probably going to be spending the rest of the weekend on this. Two problems in particular: I couldn't sign-in to Google - it said I'd been sent a notification to validate the device but nothing arrived. This took me over an hour to sort out via Windows, it seems sorted now but in truth I don't know how. And this morning, I re-installed my Arlo home security app and, like Google, Arlo is apparently sending a verification to my phone but nothing arrives. I can't login to my Arlo on Windows until it recognises my phone. What is it about the phone which neither Google nor Arlo (and potentially other apps) don't recognise?