I only wanted to report strange observations for troubleshooting the geolocation issue, nothing else.
The url is the url that sfos-upgrade wants to reach and the error message is out of the CLI echo.
All my phones are paid version and logged in.
I made a typo, it wasn’t the testphone, it was my wife’s phone she uses to read her PDF books.
TLDR: Meanwhile the real culprit for the strange behavior is found. It was a cracked screen that works fine for a year only with the disfigurement. But since a few weeks it began probably to cause ghost touches and so to irritate the system and cause crashes.
I replaced the screen with a new one, flashed the latest SFOS and it works now for PDF reading without freezing screen and my wife is now happy and mee toooo! 
edit: MAYBE my wifes phone was really not logged in correctly… I don’t remember 100% sure… (and can’t check no more now) but now all’s well that ends well.