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You can use tasks with the state set to TODO for this. That also means that ticket/change/problem templates can have multiple TODO tasks added. You can click the checkbox on the TODO tasks to mark them as DONE.
Tickets can be imported using the GLPI API.
ChromeOS supports Android apps and there is an Android agent. I've not personally tested if it works though.
This was added in GLPI 10. You can hold the ctrl key down when clicking on the column headers to add additional sort levels.
It is currently possible to do this indirectly using SIM cards.
For direct linking, see:
Done/WIP for 10.1.0.
The search option exists. If you open the search option dropdown and search "Description" it shows up as Followups > Description.
There is a plugin for this, but the information isn't the most readable since the historical logs were not meant to be searched, only viewed per asset.
https://github.com/cconard96/glpi-historical-plugin
It isn't quite to the point were I want it in the plugin directory, but it should work for what you need. It will add a "Historical" menu item under Administration that will give you a central location to search all of the historical log entries. You should know that you can only enter text to search the old and new values, and the "Search option" column which is the field being changed can only accept the numeric search ID even though it can display the label like "Name" or "Description".
Customer support service by UserEcho
Done for GLPI 10.1.0.
Related PR:
https://github.com/glpi-project/glpi/pull/14403