@lduboeuf FYI, in Germany there will be another occasion for testing cell broadcast on September 14:
"On the Nationwide Warning Day, a test warning in the form of a warning text is sent to all warning multipliers (e.g. radio stations and app servers) connected to the Modular Warning System (MoWaS for short) of the Federal Government starting at 11:00. The warning multipliers send the sample warning with a time delay to warning devices such as televisions, radios and smartphones. There you can then read and/or hear the warning. "
https://www.bbk.bund.de/DE/Home/home_node.html