Copying calendar and address book to/from flip phone

[Charlie Gibbs <cgibbs@surfnaked.ca>]

I have a TCL Flip 2 phone (model 4058G).  I've just switched to this 
phone, having gone through a few phones to find one I like.  And, of 
course, my calendar and address book are lost each time.  I've been able 
to hook up a USB cable to the phones and access pictures and music 
files, but apparently the calendar and address book are hidden someplace 
secret.  On the older phones, I was able to configure the USB port as 
mass storage and just copy files back and forth, but I don't see that 
option on this phone.  However, I found the gmtp utilitiy, which is able 
to look through the phone and copy picture and music files using MTP. 
However, I see no filesystem entries for the calendar and address book. 
Is there a way to access these files, or are they customarily hidden in 
a restricted area?

I'm running Debian Bookworm (12.11) on an Intel Core i5-4690.

I tried plugging my phone into my wife's Macbook, but got nowhere there 
either.

--
cgibbs@surfnaked.ca (Charlie Gibbs)