* Applications
** (Google) Messages
*** Duplicate phone numbers
Each contact has "multiple" mobile phone numbers: =+12 3 45 67 89 01…=
and =+12345678901=.  Must "select destination" when picking a contact
in "New conversation".

- https://support.google.com/messages/thread/164226603?hl=en
- https://support.google.com/messages/thread/186749872?hl=en
- https://support.google.com/messages/thread/193392017/duplicate-phone-numbers-in-messages-only?hl=en
- https://support.google.com/messages/thread/197315414/remove-multiple-destination-contacts?hl=en
- https://support.google.com/messages/thread/204355787?hl=en
- https://old.reddit.com/r/UniversalProfile/comments/v3p8v8/duplicated_phone_numbers_in_messages_app/
- https://old.reddit.com/r/UniversalProfile/comments/v54l1r/duplicated_phone_numbers_in_messages_app_i_found/
- https://old.reddit.com/r/GoogleMessages/comments/zkaqo9/duplicated_phone_numbers_in_messages_app/
- https://old.reddit.com/r/GoogleMessages/comments/10x90te/google_messages_app_duplicate_contact_numbers/

Deleting & re-creating the contact removes the duplicate number,
until… some time passes.  Presumably until WhatsApp syncs?

Attempted to disable WhatsApp sync in =Accounts and backup=, but it
turns back on after a couple of minutes.  If I had enough patience, I
could try turning off auto-sync globally, for all accounts.
* OS
** updates
Samsung policies for "select devices":
- security updates :: [[https://security.samsungmobile.com/workScope.smsb][7 years]]
- OS upgrades :: [[https://news.samsung.com/global/samsung-sets-the-new-standard-with-four-generations-of-os-upgrades-to-ensure-the-most-up-to-date-and-more-secure-galaxy-experience][4 years]]?